Car aux bluetooth receiverBluetooth protocol 5.0How to use car hands-freeWhether single or double earsColor aptX, standardProduct function: provide wireless signalBluetooth protocol: AVRCP, A2DP, HFP, HSPOutput interface: 3.5mm audioSignal to noise ratio: >90dBCharging time: 2HTransmission method: HiFi level, support SBC, AAC, aptX", aptxM LL