------------------------------------------------ RUSAM BL31 True Wireless Stereo Earphones Features: 1BT 5.2 More Stable and Faster Transmission, Upgraded BT chip offers fast and stable connection and transmission but lower latency. 2Binaural Design Equipped with Dual hosts, left and right ear divided design both are convenient to your use. 38 mm Large Dynamic Driver&Immersive Listening Experience, AAC/SBC dual audio decoding, 8mm DD unit with a high-density composite diaphragm, bringing you an immersive listening experience 4Low Consumption & Long Endurance, built-in 400MAH battery(Charging Case) for long-lasting endurance, Type-C charging port for fast charging,4-5 hours of music listening(charging box providing 6-8 times fully charge). 5Fit &Fell Free Design, Ergonomically designed, Comfortable to wear, stable, and never hurt the ear. Specifications: Product model: TWS BL31 Wireless connection: Bluetooth-compatible 5.2 Net weight of single earphone: 4g Total weight with charging case: 99g Talk time: about 4 hours Battery life with charging box: about 30 hours Single headset battery capacity:50mAh Charging box battery capacity:400mAh Headphone size: 28*17*21mm Charging box size: 70*30*30mm Headphone charging time: about 1.5 hours Communication distance:10 meters (barrier-free open environment) Packing List: 2 * Bluetooth headset 1 * Charging Case 1 * Charging Cable 3 pairs * Ear tips 1 * Manual About