Control Products MA-S01 Battery-Powered MiniAlarm Motion Sensor Indoor security alarm with motion sensor Passive infrared motion sensor detects motion from up to 20 feet (6m) away 130-decibel alarm sends intruders running Wireless remote control easily arms and disarms sensor Plugs into the Deluxe FreezeAlarm (sold separately) (FA-D or FA-D2) to automatically call any three phone numbers for break-in alert