Roule&reg; RL-9805V Indoor Wireless Personal Safety Alarm System Home Security Window Sensors House Alarms Door Alarms Super easy to install, no wiring and tool required, self-adhesive pad included. 80 dB alarm sound loud enough to scare the home intruder away, keeps your family and house safe 24/7. Sensor detect the vibration of a window or door during an attempted forced entry For indoor use only, ideal for remote areas of home, apartment and office. High/low/off sensitivity modes, 4 LR44 batteries are included. Low battery test botton.