Specification:Diameter length 20MM. Width 15MM. 18mm high Drive: 40 mmImpedance: 32 OHMBluetooth version: Bluetooth v4.0 + EDRPower Level: CLASS IIOutput Power: 30mWBluetooth distance: 10 meters barrierFrequency response: 20-20000 HzOperating voltage range: 3.0V-4.2VMicrophone sensitivity: -42dBwith A2DP / AVRCP high-quality stereo audio transmission and remote control protocolPowerful noise noise cancellation circuit (Active Noise Reduction)Wired and Bluetooth automatically switch to support audio inputCharging time is about 1 hour (power indicator Charging: blue light lights、 fully charged: blue light goes out)Dimensions: Diameter length 20MM. Width 15MM. 18mm highTalk time About 4 hoursMusic for about 3 hoursThe standby time is about 3-4 daysCharging Power: DC5V Power Interface [the hole] (computer USB port、 mobile phone charger、 car charger)Compatible: Compatible with Android、 Apple、 Microsoft、 Symbian 99% of with Bluetooth cell phones(IOS cell phone has power display)Color: Black、White、Pink、Blue、 Beige Troubleshooting:1. Charging: Please charge the headset before use it(The red light will turn off when fully charged).2. Pairing: If you can't pair the bluetooth with your phone、 please keep pressing the button for 5-7 seconds until the LED light flashing red and blue.If you still can't pair it、 please check if the headset is previously connected with other devices. Please find that device and disconnect it and then try again.Or please check if your phone has already been connected with other bluetooth device.3. Connecting: Open the bluetooth on your cellphone、 and then you finish the pairing、 the passcode is 0000. If your phone can't search the bluetooth、 please kindly try to restart your phone.4. LED indicator: If the LED light flashing blue、 it means that the headset is only turned on. In this case、 you are able to connect it with your cellphone. Please turn off the headset and then have a try.If the LED light flashing red、 it means that the headset is turned off.If the LED light flashing blue and red、 it means that the headset is going into pairing mode、 in this case、 you can connect it with your cellphone.5. Language change: There will be voice prompt in each steps、 if you change the language to Chinese by accident、 please try the below steps to change it back: turn on the headset、 before bluetooth pairing、 long press the function key 1-2 seconds to change the language from Chinese to English.Package included:1 x Headset(Just one for your right or left ear)1 x USB cable