The RKP-4 is the beltpack for the RKP-4 keypanel system. The wireless system is a full duplex (simultaneous talk and listen) audio system that is designed to work with ADAM, Cronus, Zeus and Zeus II Digital Matrix Intercom Systems. The RKP-4's operation is very similar to the MKP-4, BKP-4, TKP-4, and WKP-4 four button wired keypanels. The beltpack, via the base station, allows communications with a Digital Matrix and acts as a keypanel on the system.

The RKP-4B is the base station for the RKP-4 beltpack. The wireless keypanel system is a full duplex (simultaneous talk and listen) audio system that is designed to work with ADAM, Cronus, Zeus and Zeus II Digital Matrix Intercom Systems. The RKP-4's operation is very similar to the MKP-4, BKP-4, TKP-4, and WKP-4, four button wired keypanels. The base has the ability to program the frequencies of the beltpack over-the-air. The sidetone for the base's local headset and the beltpack are adjusted at the base station.