The Terratrip Peltor Compatible Professional Plus+ V2 Intercom Amplifier features Bluetooth connectivity to a mobile phone when used with a Bluetooth adaptor (sold separately). Designed to be fully compatible with Peltor intercom helmets / headsets or most other brands of intercom headsets which have a male Nexus plug. The Terratrip Professional Intercom Amplifier features separate volume controls for driver and co-driver and a radio input socket. An audio output socket allows the crew voices to be linked to a recording device for pace notes or to a video camera system.Compatible with Terratrip professional Plus+ V2 full face / open face helmet headsets and practice headsetsAudio input for music or other external audio devicesOutput socket for MP3 recorder, ideal for recording pacenotesAutomatically reduces maximum amplified noises, the electronics temporarily reduces the maximum peak of amplification so you aren't deafened if the other person shoutsAVC (Auto volume control eliminates