... 3.Waterproof,FM Bluetooth Handsfree Kit : 500m Motorcycle Helmet Headsets,bluetooth Intercom,Bluetooth Handsfree Kit Detailed Product Descriptionmotorcycle bluetooth helmet ... etc. Unlike a one-way walkie talkie, which is only half duplex i.e. it can not speak and listen ... did not have a built in audio Bluetooth transmitter, you only need to have a external audio Bluetooth transmitter (sometimes ...