Bluetooth version: V5.3HEDR Distance: 10 meters Listening time: about 30 hours Headphone battery: 200MAH Wireless frequency: 2.4GHZ Supported protocols: A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6/D11.3 Transmission distance: 10 meters Charging voltage/current: 5V/1A Charging time: about 2 hours Standby time: 200 hours Microphone sensitivity: -42Db Working temperature: -10-50℃ Headphone weight: 15G Headphone size: 6.2*5.3*1.1CM OPP bag weight: 28G 180° rotation for wearing regardless of left or right Built-in rotatable shaft, easy 180° rotation for wearing on both ears Non-in-ear design Open listening Bone conduction open audio frees the ear canal for long-term wearing without pain Composite diaphragm upgrades sound cavity with low distortion The wonderful combination of composite diaphragm + large dynamic acoustic technology restores the high frequency of music to be bright, and the fixed frequency is thick and elastic Smart digital display of power is visible LED power display shows the power at a glance and checks the remaining power in real time TYPE-C fast charging interface The battery is 300 mAh and can reach 30 hours of talk time and 48 hours of full charge in just one hour Small and light, as if nothing is wearing The body weighs only 15G and can be worn for a long time without feeling heavy High-definition voice call intelligent voice control Free your hands, just voice control YES answer/NO reject Waterproof and sweat-proof, no fear of rain splashing in life Multiple processes are rigorously designed to prevent sweat from damaging components, allowing you to exercise without fear of wind and rain