Description Features: Stable and continuous BT 5.3 chip: BT 5.3 empowers faster transmission and better stability. ENC call noise cancellation: Our algorithm combined with deep neural network algorithmcan suppress 75% of background noise and isolate voice. BABY feel technique makes it feel smooth yet com-fortable. The ergonomically designed radian ensures uniform force on ears and empowers comfortable wearing. IPX6 Water-proof: Enjoyable exercise IPX6 Waterproof can effectively resist water in daily use ( sweat,face water, or other scenes). After connecting for the first time, you can quickly pair the earphones with your device each time you take it out. Specifications: BT Version: V5.3 Transmission distance: 10m/33ft Headphone size: 58.5 * 42.5mm Battery capacity: 100mAh (each headset) Charging time: about 2 hours Music time: about 7 hours Standby time: about 250 hours Input parameter: 5V -- 8mA Battery type: lithium electronic polymer Waterproof grade: IPX6 Box size: 136 * 45 * 29mm Battery capacity: 800mAh Input parameter: 5V-500mA Output parameter: 5V-100mA Charging time: about 3.5 hours Battery type: lithium ion polymer Box weight: about 92g Package Size: 13.6*4.5*3cm Package Weight: 100g Packing list: 2* Earphone 1* Charging Box 1* Chargring Cable 1* User manual