That is the X-10 Powerhouse 2-way transceiver module model RR501. It is ceaselessly known as the “big” transceiver. Use this as the guts of any X10 wireless remote regulate system or so as to add an additional housecode to an existing system. It receives the RF signals from an X10 remote by the use of the antenna and retransmits them thru your home wiring to be received by other X10 receiver modules.
The RR501 has a two-way appliance module built-in to it that reacts to X10 line signals in addition to wireless (RF) signals, whereas TM751’s appliance module only reacts to RF signals, not X10 line signals.
The application module can also be “polled” for status (Is it on or off?). The application module can also be set to answer unit 1 or 9 in no matter what housecode that you select. Can operate as much as 16 X10 addresses on one housecode. You’ll be able to add as much as 15 extra transceiver modules for as many as 256 different codes. The specs for The application module are the similar as the TM751 mini-transceiver (120 Volts AC 15A, 1/3 HP motor load, 500 Watt incandescent lamp, and 400 Watt for a TV)
Simply plug the transceiver module into any AC outlet, extend the antenna, choose unit codes 1 or 9, and set the code wheel to correspond to the housecode (A thru P) you need it to regulate. Even if It is about twice the dimensions of the TM751 mini-transceiver, It is still sufficiently small to be able to plug it within the bottom outlet leaving the highest outlet free in order to not tie up a whole outlet.
Increased sensitivity in comparison to the TM751 transceiver
Built-in 2-pin polarized appliance module responds to unit code 1 or 9
User selectable by the use of a slide switch
Use this as the guts of any X10 wireless remote regulate system or so as to add an additional housecode to an existing system
Receives RF signals from an X10 remote by the use of the antenna and retransmits them thru your home wiring to regulate X10 modules