Model HM-568 Quantity 1 piece(s) Material Plastic hardware Color Black Type Electronic Device Function Support 500 m range full duplex talkingreal two-way wireless communication between three riders by Bluetooth system. up to 120 km working speed up to 7 hours talking time Wind noise DSP cancellationwater-resistance all weather Friendly for gloves; Auto switch seamlessly among the Bluetooth mobile phone intercom and stereo or FM radio.Support Voice dial; Mobile phone has the highest priority automatically switch to mobile phone when incoming call self restore back to intercom after you hang up; Answerrejecthang upand call functions. 5.Support the last number redial; Sharing the music form the mobile phone or connecting with GPS audio through A2DP; Support music play pause playback and forward control through AVRCP Bluetooth Version 2.0 + EDR Transmission Range 10 m FM Frequency 85~108 MHz Speaker Power 0.25 W Power Supply 3.7 V 350 mAh Working Current 50~80 mA Packing List 1 x BT interphone 1 x Accessory pouches 1 x Power adapter (AC 100~240 V / 2 -round-pin plug / 120 cm) 1 x English user manual