Extended Playtime with Enhanced Battery:Enjoy uninterrupted gaming with up to 3 hours of additional battery life; play longer without worrying about running out of power; tailored to your usage scenarios for maximum performance Dual Fast Charging; Two Times Faster:Power up both H4 Boost and Quest 3/3S simultaneously with DualBoost Charging system. Fully recharge both in just 2.5 hours with a 45W adapter, delivering 25W power to your Quest 3/3S while charging the internal battery. Zero Facial Pressure & Custom Fit: Adaptive front headrest design evenly distributes the weight of Quest 3/3S, reducing facial pressure and offering a comfortable fit for extended use, even without the facial interface; elastic side straps, adjustable top strap, and soft rear cushion ensure a secure fit for all head sizes, ideal for gaming, movie-watching, and productivity Adjustable FOV & All-Day Ventilation: Damping sider allows front-to-back FOV adjustments, while the headset lever knob provides up-and-down alignment for a clearer experience; innovative ventilation design in the fore cushion keeps the head and face cool during long sessions Lie Down Comfortably: Integrated adjustment knob enables effortless fitting; enjoy total comfort while lying down on your couch or bed, making it easy to fully immerse yourself in gaming or movies with the H4 Head Strap on Quest 3/3S