The radios are usually supplied with spare Crystals which are stored inside the unit, a Helmet Antenna and Canvas Bag. The water proof outer case is made from impact resistant plastic, with a aluminium front panel. Up to nine spare crystals can be stored on a holder inside the case. Two knobs on the front panel control the Volume and Different Operational Modes. Hand Set socket, a BNC Antenna socket, and a 24 Volt power socket are also provided on the front panel.
Battery holder is at the rear of the case.
Transmitter and Receiver frequency is set by plugging in the appropriate crystal. The Crystals are divided into 3 Colour Groups - Red, Green and Blue. Generally any Crystal in the same Colour Group can be inserted without re-tuning the radio. If a Crystal in a different band is required the radio has to be re-tuned for that crystal. Re-tuning information is provided below.