SPECIFICATION Multi pair Intercom up to 4 riders Long distance up to 1 mile (1.6 km) Multi Device Compatibility - Bluetooth connections to mobile phones, stereo MP3 players and GPS devices Stereo Bluetooth 2.0 technology with DSP (Digital Signal Processing) AGC Technology: automatically adjusts the headset volume based on ambient noise and driving speed Stereo A2DP protocol for stereo music FM Radio receiver stereo with RDS - six station memory Foldable Antenna Programmable via USB (set up the unit and update the firmware) VOX Activation: Allows users to open the intercom connection , answer and make phone calls with voice dial Voice status messages Lithium-ion polymer battery with a maximum talk time of 10 hours 2 mounting kits (plate with bi-adhesive strip and screw type clamp) Two types of microphone (boom mike and wired mike) Standard charger USB Compact, ultra-flat and streamlined INCLUDES 2 x Midland BT Next Intercom Bluetooth device 2 x Audio kit with stereo headset 2 x Interchangable wired microphone 2 x Interchangable flexibale arm microphone 2 x Fixing plate with bioadhesive strip 2 x Fixing plate with screw clamp bracket 2 x Stereo cable for iPOD/MP3 player Wall double charger.