Transmission range: 10 meters Function: battery display, call function, voice control, music support, multi-point connection Bluetooth protocol: 5.2 Channel: Stereo How to use: earplug type Whether single or double ears: bilateral stereo Color: black, white Life time: 72 (hours) Selling point two: TWS Bluetooth headset Selling point three: gaming Bluetooth headset Selling point one: in-ear Bluetooth headset