F4 Over-ear ANC and ENC Noise Reduction Wireless Headphones 1. Bluetooth 5.4 chip for low power consumption, more stable, and faster sound location detection, lightweight as a wing, and no perceptible delay. 2. High-precision PET diaphragm, 40mm precision biological diaphragm, with larger amplitude and faster response, delivering a concert-quality music experience. 3. Lightweight and weightless, with a leak-proof fit and memory steel bars, the leak-proof, close-fitting design delivers high-quality sound with richer, deeper sound. 5. Spatial sound effects, equipped with 3D sound field technology, deliver cinematic surround sound, fully enveloping you for an immersive, three-dimensional listening experience. 6. Soft protein leather earmuffs, adjustable telescopic arms, and rotating metal buttons for easy operation. Specifications 1. Bluetooth Version: V5.4 2. Transmission Range: 10 meters 3. Material: ABS 4. Speaker Size: 40mm 5. Frequency Response: 20-20,000 Hz 6. Distortion Rate: 0.1% 7. Battery Size: 3.7V, 1000mAh 8. Playtime: 120 hours 9. EarbudEarcup Material: Protein 10. Weight: 110 grams Packing List 1. Bluetooth headset x 1 2. Charging cable x 1 3. User manual x 1 4. Storage bag x 1