security alarm installation
Most panels also contain a cellular radio that connects them to a monitoring
center if you subscribe to a professional monitoring plan, and they
almost always have a speaker and a microphone for two way communication with a monitoring agent. Smart Smoke Detector
The cellular radio is also used to push updates to the system.Work For Alder Security
For example, the $229 SimpliSafe Foundation is a starter kit that gives you the hub, a door/window sensor, a motion sensor, and a yard sign. Additional door/window sensors go for $14. Home Security Systems
99 each and you can order glass break detectors for $34. 99 each, smoke detectors for $29.