read the unit manual here - Brash Imports

BluetoothMake a phone callAfter pairing done, you can make a phone call through touchscreen or phone record.A: Make a phone call via cellphoneWhen making a phone call, the [ ]will be shining.C: Touch [Transfer] icon to answer the calling by cellphoneTouch it again to answer the calling by the bluetooth of theunit.B: Make a phone call via touch screenInput the numbers on the screen, press [the numbers;Press [ ] icon to answer a phone call;Press[ ] icon to cancel or hang up.C] icon to correctHang upYou can press the []button to hang up.Answer the phone callAnswer the phone call features as follows:A: After pairing done, the cell phone function can beoperated through the unitB: When there is a phone call coming, the unit will switch toshow the calling number automatically.Noted:If the unit does not have this function, please skip it.Some models of mobile phones are not supported by theBluetooth module of this unit. In addition, because differentbrands mobile phone use different Bluetooth module andsoftware, so some features may not work well or compatiblewith it in use.19