Feature: 1. Smart connection: Take out power on Auto pairing memory connection. 2. Bluetooth 5.0+EDR: New generation Bluetooth technology Faster and more stable connection. 3. Pure great sound: Triple frequency equilibrium Composite membrane moving coil HIFI sound quality. 4. Binaural headset : Binaural multi-function button Easy operation of music, phone calls. Product model: TWS-M1 Specification: 72×38×30mm Working voltage: 3.3V-4.2V Bluetooth version: V5.0+EDR Battery capacity: 45mA/350mA Length of use: 3-4 hours Standby time: about 60 hours Speaker type: titanium composite film Transmission range: 2.40GHz-2.48GHz Sensitivity: 98+3dB Communication distance: effective distance 15 meters In-ear mode: oblique into the ear to fit the ear contour Package Including 2* Earphones 1* USB Cable 1* User Manual