DUAL USB CAR CHARGER : 3.1A and 1AInput 12v/24v offer convenient and charging for you and your friends.USB charging cable is not included.</br>BLUETOOTH FUNCTION : Bluetooth V4.0 Transfer Calling / Music / FM / . 5% every hour low power consumption when use bluetooth play music. Mobile navigationVoice broadcast . Bluetooth connect distances : 5 meters.Fit for most of android and IOS.</br>HANDS FREE FUNCTION : Built-in MicrophoneSwitch to Hands-free mode automatically from music playing status when receiving calls.Answer/Reject/Hand up/Recall all in one keypad.</br>CAR BATTERY VOLTAGE FUNCTION : Show 3 seconds of Auto voltage when put in the Car cigarette lighter and Speech battery case.Let you always keep battery state of health.Then it will enter the automatic play mode.</br>MUSIC PLAYING FUNCTION : Support Bluetooth Music/ USB Disk/ TF Card / WMA / MP3 format. Listening to music while charging.Power off memory functionFrom broken song began to play.</br></br>Product Description</br></br><p><b>Bestrillion Bluetooth Car ChargerBluetooth FM Transmitter & Music Sounds adapter?? 3.1A/1A Dual USB Port Charger</b></p> <p><b>1.Dual USB Port Car Charger:</b><br> The 1A Port: Can charge small screen cellphone??camera and read USB data.Please use pure charge line when use this one charging.<br> The 3.1A Port: Can charge for ipad?? big screen cellphone etc.<br> Input voltage: 12-24V?? Output voltage: Max 5V DC/3.1A</p> <p><b>Before using?? please turn the car radio channels to one of Frequency 87.5-108.0Mhz?? then plug the device?? make sure the car charger keeps the same frequency to the car radio channels.</b><br> If there has noise interference?? please adjust channels as below:<br> 1.Choose an blank and clear channel in the car audio.<br> 2.Long press the FM transmitter answer key until the LED display flashing.<br> 3.Turning the answer knob adjust the s