Function:1. Support for the left ear ear interconnected, left channel & right channel output independently2. Single also can be used as a stereo bluetooth headset3. Wireless phone, wireless music playingNewest Version comes with "Power On/Off" function on the Charging Dock.Model: the TWS - K2Version: Version 4.1 + EDRSupport agreement: HSP, HFP, A2DP, AVRCPSize: 28 * 20 * 28 mmWeight: 5.0 g * 2 + 45 gStandby time: 100 hoursPlaying time: 2.5 hoursTalk Time: 2 hoursColor optional: black and silver, silver, red, whiteAppearance of craft: UV + frosted rubber oil, bluetooth headset charging box of frosted UVCharging box capacity: 450 mah (charge about 3 times)Accessories: charging cable, ear cap, ears hang, manualCharging box size: 80 * 60 * 30 mmHow to Pair K2 earbuds? 1. Long press left and right mini earbuds together until two indicators light flash alternately with red and blue light. 2. Open the bluetooth of your music devices, to search "TWS-K2" and pair it. 3. When the automatic prompt voice in mini earbuds says "Second device connected", it means earbuds connects with bluetooth devices successfully.Please note: When calling, only the Left Channel Earbud has voice. This safety feature allows you hear the traffic while driving.Package Include: 2 x K2 Earbuds3 x Spare Ear Tips( L/M/S) 1 x Charging Box1 x Usb Charging Cable1 x User ManualNote: Without original retail package box.