Two motors, two sonic stimulators, and one strikingly advanced stroker: the LELO F2S™ Double Sonic Sonic Masturbator & Stroker brings technology and male stimulation together in a whole new way. Instead of relying solely on traditional vibrations, the F2S™ Double Sonic uses two sonic stimulators positioned on either side of the soft silicone interior. Together, they create wave-like sensations along the penis. With 13 different modes, 16 intensity levels, app control, AI Interactive, and the new Humanize mode, this is certainly no run-of-the-mill masturbator. Rather, it’s a small technological playground in teal and black.
The F2S™ Double Sonic is 14 cm long, has an outer diameter of approximately 8.2 cm, and weighs 360 grams. The open design and extra-soft silicone interior allow for manual movement, while the dual sonic motors add their own rhythm to the experience. The LELO™ app also unlocks features that allow the masturbator to respond to movement, mimic natural variations, and even be used for stamina and pelvic floor training.

What makes the Double Sonic different?

At the heart of the LELO F2S™ Double Sonic are two separate motors that power two sonic stimulators. These are located on either side of the silicone sleeve.
Instead of simply creating a traditional vibrating contact point, the stimulators generate wave-like movements along the length of the penis. The two motors work together and respond to the selected mode and movement of the stroker.
That’s what gives the Double Sonic its unique character. You combine the motion of a masturbator with sonic stimulation that spreads through the soft material like waves. It’s as if a classic stroker took an intensive course in acoustic engineering and then decided that a single motor was actually a bit too ordinary.

Two Motors and Dual Sonic Stimulation

The two motors represent a key difference from the original LELO F2S™. Each controls its own sonic stimulator, building stimulation from both sides.
The motors don’t simply operate independently side by side. Depending on the selected function, their rhythm and coordination change. This creates different wave patterns and intensities.
This technology allows the sensation to vary subtly without relying solely on the speed at which you move the stroker.

13 different modes

The F2S™ Double Sonic features a total of 13 modes. Eight of these are accessible directly on the device. Another five functions are unlocked via the LELO™ app.
This means you can also use the Double Sonic without a phone. If you want to take full advantage of all its features, the app offers significantly more options.
This makes the masturbator suitable for both simple operation and extensive experimentation. One time, just three buttons and you’re done; the next time, let your smartphone take over.

16 intensity levels with SmoothRise™

In addition to the various modes, Double Sonic features 16 intensity levels. For this, LELO uses its proprietary SmoothRise™ technology.
SmoothRise™ was developed to allow the intensity to change gradually. Instead of abrupt jumps between low and high settings, the transition is smoother.
This allows you to more precisely find an intensity that feels comfortable and adjust it step by step during use.

Humanize mode for natural variation

One of the most notable new features is Humanize. This mode is available via the LELO™ app and adds subtle variations to timing and intensity.
A machine normally repeats the same pattern with extreme precision. Humanize deliberately breaks that regularity by introducing subtle changes in the way both motors work together.
This creates a less mechanical and more varied rhythm. Not a metronome that stubbornly keeps ticking the same beat, but a system that actually makes small deviations part of the experience.

AI Interactive responds to your movement

Double Sonic also features an AI Interactive mode. A built-in sensor detects movement and uses this information to tailor the stimulation accordingly.
As a result, the intensity and operation of the motors can respond to the rhythm at which you move the stroker. Faster, slower, and varying movements can thus influence the device’s response.
This feature is used in combination with the LELO™ app and makes the F2S™ Double Sonic more than just a masturbator with a preset vibration program.

Controlled via the LELO™ app

The F2S™ Double Sonic can be connected to the LELO™ app via Bluetooth. This gives you access to additional features and settings.
In addition to Humanize and AI Interactive, the app offers additional modes and training options. This allows you to personalize the masturbator more extensively than you can with the three physical control buttons alone.
Meanwhile, direct control remains available as usual. A smartphone is therefore not required if you only want to use the built-in functions.

Stamina Trainer

LELO didn’t develop the F2S™ Double Sonic solely as a masturbator. Through the app, the device can also be used as a stamina trainer.
The training features are designed to help users learn to manage arousal more consciously and practice control. To this end, the app offers special routines that can be followed during use.
This gives the Double Sonic a training function in addition to its recreational use. Play and exercise are remarkably closely linked here.

Guided Kegel Exercises

The LELO™ app also includes guided Kegel exercises for men. These focus on consciously contracting and relaxing the pelvic floor muscles.
The pelvic floor plays a role in, among other things, erections, ejaculation control, and urinary control. Regular pelvic floor training can help you learn to use these muscles more consciously.
Double Sonic thus combines stimulation with a feature you’d expect to find in a fitness app rather than a masturbator.

Extra-soft silicone interior

The body-contacting part is made of extra-soft, body-safe silicone. The material is flexible and molds itself around the penis during use.
The inner opening measures approximately 3.4 to 4.5 cm. The outer diameter is about 8.2 cm, giving you a sturdy body to hold while the interior is significantly softer and more flexible.
Apply a generous amount of water-based lubricant to the interior. This reduces friction and is safe to use with the silicone material.

Open stroker for manual movement

The F2S™ Double Sonic is not a fully automatic masturbation device that moves up and down on its own. It is a manual stroker where you determine the movement and pace yourself.
The electronic technology then adds dual sonic stimulation. This allows you to maintain control over movement and speed, while the two motors provide a second layer of stimulation.
It is precisely this combination that makes the design interesting: you don’t have to hand over control to a mechanism to still receive active electronic stimulation.

Sensor detects usage

The built-in sensor technology plays a role in more than just AI Interactive. F2S™ Double Sonic can detect when the device is in use and adjust the stimulation accordingly.
This supports the interactive features and ensures that movement becomes an active part of how the device operates.
So the electronics aren’t simply running a fixed program; in the more advanced modes, your own rhythm becomes part of the control.

14 cm long and 360 grams

The LELO F2S™ Double Sonic has a total length of approximately 14 cm and an outer diameter of about 8.2 cm. It weighs approximately 360 grams.
As a result, the Double Sonic feels significantly more substantial than a small pocket masturbator. The casing provides enough surface area for a firm grip and space for the dual motors and electronics.
The internal usable length is approximately 13 cm. Thanks to its open and flexible design, use isn’t solely about the exact internal dimensions, but primarily about movement along the soft silicone sleeve.

Aluminum alloy, ABS, and silicone

For the F2S™ Double Sonic, LELO combines body-safe silicone, ABS, and an aluminum alloy. Each material serves its own function.
The soft silicone is used for the body-contacting part, while ABS and aluminum provide sturdiness and a high-quality finish to the casing.
The teal-blue and black color scheme enhances its modern, technical character. No toy-like design—just a sleek device that’s more reminiscent of premium electronics.

USB-rechargeable

The F2S™ Double Sonic has a built-in 3.7 V lithium battery and is charged via USB. This eliminates the need for disposable batteries.
A full charge takes up to approximately 2 hours. A fully charged battery then allows for up to about 2 hours of use, depending on the functions and intensity used.
The standby time is up to approximately 90 days. That’s convenient when the Double Sonic has been on vacation in its satin storage pouch for a while.

Automatic Shut-Off

LELO has built in an automatic shut-off feature. After approximately 20 minutes without further operation, the device automatically turns off.
This helps prevent the battery from draining unnecessarily if you forget to turn off the masturbator manually.

Relatively Quiet Operation

Despite the dual motors, LELO specifies a maximum noise level of less than 60 dB. This means the F2S™ Double Sonic was designed with a focus on relatively discreet operation.
The actual noise level can, of course, vary depending on the selected intensity, how you hold the device, and the environment in which you use it.

Water-resistant design

The F2S™ Double Sonic features a water-resistant design. This makes cleaning the silicone interior significantly easier.
After use, rinse the parts that come into contact with the body thoroughly and remove all traces of lubricant. If desired, use a suitable toy cleaner and let the device dry completely before storing it or plugging it back in to charge.

Tips for Use

Before use, apply a generous amount of water-based lubricant to the soft silicone interior. Start with a low intensity and a gentle manual pace so you can get used to the combination of movement and sonic stimulation.
Then, not only try out the sixteen intensity levels, but also vary your own movements. The dual sonic stimulators respond particularly well when you alternate between your own rhythm and electronic stimulation.
To discover all the possibilities, connect the Double Sonic to the LELO™ app. Humanize, AI Interactive, and the training features give the device a significantly broader range of functions than the eight built-in modes alone.

Cleaning and Storage

Clean the LELO F2S™ Double Sonic thoroughly before and after each use. Use lukewarm water and, if desired, a suitable toy cleaner. Be sure to remove any lubricant residue from the silicone interior.
Then let the device dry completely. Store the Double Sonic clean and dry in the included satin storage pouch to protect the soft silicone surface from dust and contact with other materials.

General Features

• Dual sonic stimulation
• Two separate motors
• Two sonic stimulators
• 13 modes in total
• 8 built-in modes
• 5 additional app modes
• 16 intensity levels
• SmoothRise™ technology for gradual intensity control
• Humanize mode via the LELO™ app
• AI Interactive mode
• Built-in motion sensor
• Stamina Trainer
• Guided Kegel exercises via the app
• Bluetooth connection to the LELO™ app
• Manual stroking motion
• Extra-soft silicone interior
• Materials: body-safe silicone, ABS, and aluminum alloy
• Color: teal/blue and black
• Total length: approximately 14 cm
• Internal usable length: approximately 13 cm
• Outer diameter: approximately 8.2 cm
• Internal diameter: approximately 3.4–4.5 cm
• Net weight: approximately 360 g
• USB-rechargeable
• 3.7 V lithium battery
• Charging time: up to approximately 2 hours
• Usage time: up to approximately 2 hours
• Standby time: up to approximately 90 days
• Automatic shut-off after approximately 20 minutes
• Maximum noise level: less than 60 dB
• Water-resistant
• Water-based lubricant recommended
• USB charging cable included
• Satin storage pouch included
• User manual included

FAQ

What makes the LELO F2S™ Double Sonic Sonic Masturbator & Stroker Teal special?
The F2S™ Double Sonic uses two motors and two sonic stimulators positioned on either side of the soft silicone sleeve. These create wave-like stimulation along the penis. In addition, the device features 13 modes, 16 intensity levels, and extensive app functions.
Can the LELO F2S™ Double Sonic Sonic Masturbator & Stroker Teal be used without the app?
Yes. Eight modes are available directly via the controls on the device. Through the LELO™ app, you gain access to five additional modes and features such as Humanize, AI Interactive, stamina training, and guided Kegel exercises.
How big is the LELO F2S™ Double Sonic Sonic Masturbator & Stroker Teal?
The masturbator is approximately 14 cm long and has an outer diameter of about 8.2 cm. The internal usable length is approximately 13 cm, and the device weighs about 360 grams.
How long does the LELO F2S™ Double Sonic Sonic Masturbator & Stroker Teal last on a single charge?
A full charge takes up to approximately 2 hours. With a fully charged battery, you can use it for up to approximately 2 hours. Actual usage time may vary depending on the selected functions and intensity.
The LELO F2S™ Double Sonic combines a soft stroker with dual sonic stimulation, two motors, sixteen intensity levels, and smart app features that respond to your usage. It’s a masturbator that has found its home somewhere between a premium sex toy and personal technology—and is clearly right at home there. Your order will be carefully packaged and shipped quickly and completely discreetly.