This multiple device RF base works with X10's line of RF remote controls and PIR motion sensors. Wireless X10 devices need this base unit to catch the radio signals and convert them to X10 signals on the electricity line. Add as many handheld remotes and X10 wireless devices as you want to each base. As long as the transmitters are on the same house code as the base, they will all control the same devices. Be careful to have only one RF base unit or X10 security console (which also change RF signals into X10 signals for the electricity line) per housecode. If more than one base unit is used on the same housecode, X10 signal collisions may result.