Product parameter description:Rated working voltage: 12V-24VOperating temperature range: 063Support playback format: MP3/WMAFrequency response: 20HZ-15KHZBluetooth transmission distance: 5M-10MFM transmitting frequency: 87.5MHZ108MHZRead U disk/Micro SD card capacity: up to 32QC 3.0/fast charging source IC: CX8825 + 6601Q (QC 3.0 fast charging identification IC)Bluetooth connection distance: 5 metersMike: 38dBFM transmitting frequency band: 87.5108MHzBluetooth, T card, U disk, playback current: 63ma81maPower on display battery voltage: error +/-0.3VCurrent noise: no noiseSound distortion: no distortionCar charger limit voltage: 1130VOperating temperature range: 053Play pause function: short press the phone buttonIncoming call to answer the call: click the phone buttonUnnumbered redial function: double-click the phone buttonReject a call: long press the phone buttonHang up the call: Click the phone buttonBluetooth wait for connection prompt: POWER ON-BluetoothPrompt for successful Bluetooth connection: Bluetooth ConnectedVolume function: Rotate the phone key knob to adjust the volumeT card/U disk support playback format: MP3 / WMA / FLACAuto-connect after power-on: automatically connect to the last connected mobile phone when power-onNo-load voltage of slow charge charging port: 55.25VSlow charging port charging 1A: 4.75V5.25VNet weight: 49gProduct gross weight: 74gPacking size: 11.2*7.2*5.5 CM