3. 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. The cellular radio is also used to push updates to the system. 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. 99 each and you can order glass break detectors for $34. 99 each, smoke detectors for $29. 99 each, and water sensors for $19. 99 each. The LifeShield Essentials system goes for $199. 99 and comes with a base station, a keypad, a keychain fob, four door/window sensors, a motion sensor, a fire safety sensor, and an Asus Memo Pad 7 tablet with LifeShield software that you can use to control everything.

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