Akoyu Door Alarm Sensor - Door Alarms For Kids Safety, 120 Db Window Alarm Sensors, 4 Modes Open Alarmclosedingdongreminder Burglar Alarm For Home Safety Travel Office Shop Apartment (4 Pack)AKOYU Wireless DoorWindow Alarm Sensor This wireless magnetic contact sensor alarm is designed for home, travel, office, store It has 4 working modes to remind..