K4 Duo AIO Audio Head Strap with Battery
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- All-in-One Audio Head Strap with Built-in Battery
- Premium Sound. Total Immersion.
- 45W Dual-Port Fast Charging
- Ergonomic Design for Perfect Balance & Comfort
- Built to Last. Safe for Everyday Use.
Fits like it’s made for you.
An ergonomic design meets memory foam comfort—for a fit that feels natural, session after session.
Keeps your focus.
Gently supports the headset from above—so the view stays steady, and pressure fades away.
Built-in simplicity.
One cable. Zero distraction.
Turn. Fit. Share.
A simple twist adjusts the fit—so it’s always ready, whether it’s for you, your kid, or your co-op partner.
Now for the real headliner.
The built-in audio system isn’t just along for the ride—it’s here to transform how VR sounds, feels, and flows.
Silent control. Instant switch.
With a single flick, move your audio wherever it needs to be—Quest 3, K4 Duo, or back again.
Folds down. Stays out of the way.
The earphones rotate down with ease, and tuck away just as neatly.
Shifts with you.
The arms tilt vertically to match your natural posture—no pressure, just perfect alignment.
Dialed in to the last detail.
A final adjustment brings the earphones exactly where they should be—for fit that disappears.
Tech Specs
Meta Quest 3 / Quest 3S
459 g
250 × 280 × 135 mm
20.4 Wh
45W
For optimal charging speed, use a 45W USB-C power adapter.
Approx. 2.5 hours (when charging with Quest 3/3S together)
+2 to 2.5 hours*
*Actual time may vary by usage
Customer Reviews
Here is my full review: https://youtu.be/3vEdDSZL7RA
Pros: Extra battery, simultaneous charging, improved audio and immersion levels, improved comfort, easy to assemble, only one small cord on the whole head strap, weight (it isn't too heavy even with the headphones on the side).
Cons: Price. This one isn't cheap!
Would I recommend? If you have the money and want a comfortable experience that includes better audio and battery included all in my head strap, then this is for you. I love watching movies with this as the audio quality is great and the immersion level is even better.
