... 3.Water-resistance, all wereal two-way 500m bt interphone for motorcycle Details Product Details500m Bluetooth Interphone,Bluetooth Intercom,Walkie Talkie: 1.Up to 120Km ... vehicle, buildings non line of sight etc. Unlike a one-way walkie talkie, which is only half duplex i.e. it can not ... to 120Km!3) As a wireless Bluetooth music receiver and speaker, this BIM has EDR and A2DPprofile , with EDR and ...