In SX Microcontrollers, SX/B Compiler and SX-Key Tool, transmon wrote:

Want to make three transmitters and one receiver connected to a sensaphone for alarm system for construction site, transmitters will be powered by batteries and have a simple normally closed contact on craw space door or any other doors. Would like to run several transmitters and one base receiver connected to a sensaphone. If transmitter one is activated it sends a coded signal to to a base that triggers the #1 contacts on the sensaphone, calling and identifying the site of the break in. We are battling the copper theft's that have stripped the wires out of buildings not just once but twice, this is a nationwide epidemic any suggestions would be much appreciated. Have found construction sentry's online costing from $5000 and up.

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