System Door Opening Sensor Window Security Alarm Wireless Alarm Door Sensor Door Annunciator

Label:Yes 4 in 1 Multi-Function --- General Alarm, Constant Alarm, Closing-door Alert (Time Delay), Doorbell. Package Included: 1pcs Door/window Alarm. Battered by 2pcs AAA batteries (not included). Materials: ABS Size: AS The Picture Item Type: Wireless sensor

Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.