Get hands on the most compact, intense voice output yet energy saving, bluetooth-driven KDM Wireless Speaker series that are created to give you the experience of what the ultimate audio anent technology feels like. Feature : In built TWS function Sound : Stereo pairing crystal clear HD calls : Yes Power saving function : Yes Mode : Auto off Compatibility : Compatible with all mobile phones, music players, portable gaming devices and computers Bass : Powerful Bass Transmission distance : 10M Battery : 500mah Playing time : 2-3 hr charging time : 1 hr Bluetooth version : 4.2 Out put power : 3w Working voltage : DC 5V Colors : Black, Grey, Red, Yellow