White. This Amalock door and window sensor is designed for the use with the ALM5100 smart alarm. It is suitable for internal use and is supplied with mounting strips. Whenever the sensor is triggered (magnet is separated from the sensor), a push notification including the sensor name will be sent automatically to the registered users, and the alarm will sound.. Slimline design. CR2032 3V lithium battery included. Supplied with mounting strips. Low battery warning