Bluetooth Earphone Earbuds Twins Headset Mini Wireless Stereo Charger Usb Size: 28 x 20 x 28 mmWeight: 5.0 g x 2 + 45 gStandby time: 100 hoursPlaying time: 2.5 hoursTalk Time: 2 hours Appearance of craft: UV + frosted rubber oil, bluetooth headset charging box of frosted UV Charging box capacity: 450 mah (charge about 3 times) Accessories: charging cable, ear cap, ears hang, manual Charging box size: 80 x 60 x 30 mm How 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: 2 x K2 Earbuds3 x Spare Ear Tips( L/M/S) 1 x Charging Box1 x Usb Charging Cable1 x User Manual