Feature: Bluetooth 5.0 version, available for most of devices with Bluetooth function. Music hat with double earphone Set-in MIC, available for cell phone to transmit the speaking phone to your audio devices directly so that the user can hand free answering phone up via the device. Set-in Li-ion chargeable battery, charge via USB Cable, long stand-by time. Specification: Bluetooth: V5.0 Transmission distance: 10M or so Transmission distance of MIC: ≤1 M Li-ion Battery: 3.7V/180mA Charging time: 2.0 hours Continuous working time: about 4-6 hours Colour: Black Material: plastic Package Contents: 1 x Headphone Cap 1 x USB Cable 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.