Bluetooth version 5.0Frequency range 2.4 GHzBuilt-in lithium batteryCan be used for 8 hours after charging for 2 hoursBluetooth range: 10mSize: 53mm * 11mm * 25mmIf this is your first time using this device, please configure this device first.1. To enter the pairing mode, press and hold the on/off button (button1) for 5 seconds until the red and blue LEDs flash.2. Look for a music receiver on your mobile phone or compatible transmitter. Touch and hold a button to turn it on, and it will automatically search for compatible transmitters; there is no password to connect to an Apple or Android device, and the LED light below the button indicates the status and charging status of the device.3. The devices must now recognize and pair with each other. After successfully trimming, the LED on the music receiver will slowly flash blue.4. To complete the pairing, some devices require a passcode or passcode, please enter "0000"5. After successful pairing, you can turn off the device. To reconnect, simply connect the two without pairing again.Built-in microphone for hands-free conversation while drivingBroad compatibilityTwo devices can be linked at the same time, compatible with mobile phones, cars, tablets, home speakers, car audio, headphones, so your device can immediately have wireless functionsPackage Included:1*Bluetooth receiver1*USB power cord1*3.5mm audio connector1*User Manual