The Draper 121062 WRT/R Handheld RF Transmitter and Receiver consists of a receiver and hand-held transmitter which controls an LVC-III Low-Voltage Interface or MC1 Low-Voltage Control Module via radio frequency. Its range with fresh batteries is approximately 75'. The transmitter is approx. 23/8" wide, 5°" long, and 1/2" thick. The Transmitter operates on two AAA batteries (included). The receiver is approx. 37/8" x 21/8" x 1", with an antenna approx. 1°" long, and a 10' long, 4-conductor modular cable, which plugs into a standard RJ-11 plug on the LVC-III or MC1. Each Receiver will learn up to five Transmitters.