This device use for control false opening of fire exit door. We know the fire exit door in staircase should closed always to keep the exit staircase smoke free. 

If anyone kept the door in open for certain period of time this device will alarming till to close the door. 

- Product: Fire Exit Door Flase Open Timing Alarm Devices

- Power: Rechargabe type 9v battery

- Burzzer Type: Electronics builtin 

- Package include alarm and timing control unit, door sensor, manual, fixing screw etc.

- Use for fire or any door that need to close normally.

- Brand: MASK

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