Name: XG-12 Bluetooth Earphone Weight: 28.2G Sensitivity: 114 ±3dB Size: 2.3*1.7cm Frequency range: 2.401-2.480GHz Working Time: Music/ 4-5 hours (The Volume will affect the time) Frequency response: 20Hz-20KHz Output power: 35mW Talk time: 3-4 hours, play time: 3-4 hours Music Playing Time: up to 4 hours Frequency Response: 20 ~ 20000Hz Working current: 55mA Impedance: 32ohm Bluetooth A2DP Working range: 10m Charging Time: 1h-2h Charging voltage: DC5V 350mAh Package list: 1 * Bluetooth Earphone 1 * USB Charging Set 1 * English and Chinese User Manual Bluetooth 5.0 master control chip, support handsfree date connection in 10m. Can talk, listening to music. Built-in DSP audio processing system, can be a very good eliminate Noise and echo, to ensure clear communication, and music. Super Mini design earphone hidden in the ear, Small and light, stealth design.