Features: 1)Low battery indication. 2)When water leak is detected by the sensor,the unit will give alarms. Features: 1)TEM NO. MT400 2)When water leak is detected by the sensor,the unit will give alarms 3)Alarm : Loud > 95db 4)Low battery indication 5)Power by 1 x 9V 6F22 battery(battery not included) Water leak alarm