... (HFP 1.5)* Supports A2DP1.2 and AVRCP1.0 profiles ,* RF Frequency Range: 2.402-2.480GHZ, 2.4G ISM band* Radio ... , -42±3dBCharging interfaceMini8pin USBButtonKeypad, MFB,Answer Key, Volume ButtonRF Specification Frequency band2.4G ISM bandFrequency range2.402-2.480GHZSpectrumFHSSModulationGFSK,π/4 DQPSK ...