This battery-powered unit detects motion up to 30 feet away, then sounds a piercing alarm and flashes a series of blinding strobe flashes to scare intruders away and send an alert. Installs in minutes with the included bracket on either a table or wall, and its convenient keychain-sized Remote lets you arm or disarm it at a distance. Plus, if there's ever a power failure, you can also use this sensor as an emergency light option.
The strobe isn't the only light.
On the front of this Sensor Alarm are 4 red indicator lights. The two located in the middle, left-hand side are your battery indicators. They'll let you know when either your 9V or four AAA batteries are running low and need to be replaced. This ensures you'll always be protected by this Motion Sensor. The 2 light indicators at the bottom of the unit let you know when you're on a delay. After you press the remote button to activate your alarm, the left, lower light will signal that you've armed it. You have 35 seconds to get away from the unit before it arms. When you come home, the right, lower light will illuminate as soon as it senses motion. You then have 35 seconds to turn this sensor off. These lights are very small, but they're incredibly important and will let you know what's going on with your Sensor.