These bone-conduction earphones transmit sound through the cheekbones instead of traditional in-ear audio. This allows for situational awareness while listening to music or taking calls SFE on-ear technology, and silicone earhook, really feel-free wearing. Fully open, not in the ear, while enjoying the music, you can also perceive the sound of the outside world in real-time Open HIFI sound effect, high-fidelity sound quality, 16.2mm diaphragm speaker, shocking and dynamic sound quality CVC binaural call noise reduction reduces the background noise of the call and communicates without hindrance as if face-to-face The earphone battery is 85mAh, and the Bluetooth music mode has a battery life of about 10 hours. The charging compartment is 400mA, which can charge the earphones 3 times, and the overall battery life is 40 hours The earphones have two sound effects, "Bee Play Mode" and "Music Mode", which can be used for listening to songs and playing games Specifications: Bluetooth Chip: JL6973 Bluetooth Version: V5.3 Transmission Distance: 10m Drive Unit: 16.2mm Working Frequency: 2.402GHz-2.480GHz Impedance: 20Ω±15% Sensitivity: 123.8db±3 Battery Capacity: 85mAh Charging Box Capacity: 400mAh Charging Box Capacity Time: 2H Music Time: About 10-12H (80% volume) Talk Time: About 9.5-10H (80% volume) Standby Time: About 120days Input voltage: Type C, DC 5V Support Bluetooth protocol: A2DP1.3/AVCTP1.4/AVDTP1.3/AVRCP1.5/HFP1.5/SPP1.0/SMP/L2CAP4.2