it comes with spare replacement batteries so that you never run out of battery supply.Made of motion sensitive hardened steel lock, the alarm lock will give the alarm when it detects any motion. When the lock is vibrated twice, within 5 seconds the alarm will sound so that you know intruder is already inside your house. If you missed to listen the first alarm, you need not worry as the alarm sounds in 10 second intervals. It has 3 matching copy protected keys and is corrosion resistant, making it long lasting.
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