Systems and methods for monitoring conditions are provided. A system can comprise a plurality of wireless transmitters and a plurality of repeaters. At least one wireless transmitter can be integrated into an alarm. The repeaters can be dispersed throughout a region at defined locations. The system can...http://www.google.com.hk/patents/US8064412?utm_source=gb-gplus-share專利 US8064412 - Systems and methods for monitoring conditions
