Product information: Product features: biological diaphragm, three - screen display Weight: about 3.8g (per ear) Color: black Waterproof: Waterproof for life Bluetooth scheme :Bluetooth V5.0 Supported protocol :HFP/HSP/A2DP/AVRCP Compatible device: Bluetooth device above 2.0 Operating distance :10 meters Single ear playback time :5H (70% volume) Battery Type: Polymer lithium ion battery Output specification :5V/300mA Headphone battery capacity :50mA Headphone charging time: 2 Charging bin capacity :300mA/h Packing list Bluetooth Headset*1