Product descriptionFeatures:Product name: Bluetooth 5.0 hands-free car speakerphoneBluetooth: 5.0+EDRBluetooth frequency: ISM2.4GHz-2.48GHzEffective distance: 10 meterBuilt-in rechargeable battery: 3.7V, 500mAhBuilt-in echo cancellation and noise reduction technology.Bluetooth 5.0 fast and stable connection.Built-in rechargeable battery for 20 hours of continuous operation.Connect two mobile phones at the same time.Automatic shut-down after disconnecting for five minutes.Color: blackOperation:1. Charge your Bluetooth in-car speaker:Make sure that your Bluetooth in-car speaker is fully charged before you start using it. Please use micro USB cable and no more than 5V charger to charge it. When the LED is solid red, it's charging. When the LED turns off, it's fully charged2. Turn On/Off the Bluetooth speaker:Long press the button for 2-3 seconds to turn on the device, you will hear the voice prompt "Power On", the LED will flash quickly. Long press the button for 2-3 seconds to t