Built-in power amplifier chip, surround high-fidelity stereo sound Bluetooth 5.3 version, ultra-low power consumption, Bluetooth one-to-two function, can connect two mobile phones at the same time and use it at the same time You can choose from two modes for incoming calls: automatic | manual answering of calls, freeing your hands and wireless freedom Intelligent power saving, can work while charging, large-capacity battery, can listen to music continuously for more than 12 hours, long standby time of 160 hours You can listen to music while charging, solving your worries, intelligent noise reduction, and clear calls Name: Motorcycle Helmet Bluetooth Earphone Bluetooth version: 5.3 Frequency: 2.402GHz-2.480GHz Range: 10 meters Microphone transmission distance ≤1 meter Lithium-ion battery: 3.7V/250mAh Play time: ≤12 hours Charging voltage: 5V Charging time: ≤1.5 hours Standby time: ≤160 hours Colour:Black Material:ABS Package Contents: 1 x Earphone(Built-in 250 mAh battery) 1 x Charging Cable 1 x Microphone Sponge Cover 4 x Nylon Sticker 1 x Instructions in Chinese and English Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.