** MAIN UNIT ONLY- NO ANTENNA **Used item, it is sold as pictured, please STUDY MY ACTUAL PICTURES of this item NOT THAT GENERIC STOCK ONE to see what?s included with this sale and its overall condition. Do your research before buying to be sure it's what you need, there is a restocking fee for my items. I WILL WARRANTY THIS ITEM, PLEASE LEAVE MY CUSTOM-MADE WHITE SECURITY TAMPER STICKERS OR SERIAL NUMBERS INTACT ON IT. If you have any questions, please contact me BEFORE buying. Pay attention to the posted estimated delivery time, all my items are shipped SIGNATURE REQUIRED UPON DELIVERY for security. Please buy accordingly, Thanks W1B Additional Details ------------------------------ Product description: The RM-433 is a radio frequency receiving device that operates at 433MhZ. It is designed to receive signals that are transmitted by RTI universal system controllers. The RM-433 contains a microprocessor that monitors all received signals so that RF noise and data from non-RTI transmitters is filtered out. When valid RTI data is detected, the RM-433 passes the signal through its output driver which allows the data to travel long distances over wire. The output driver is compatible with industry standard infrared repeating systems*, and can be wired together with those systems or with additional RM-433 units. This allows RTI control systems to be controlled from almost any location with either IR or RF transmitters.