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Motion Sensor Alarm Lock Home, Waterproof Anti Theft Lock Alarm for Home Door With 3 Keys, Alarm Pad Lock for Home Safety, Security, Bike, Bicycle, Universal Use 110DBA Siren - Black thickened shackle lock office windows cycle metallic waterproof 110d super sound 2 modes high-quality aluminum easy to useLocking Mechanism: The alarm lock has a sturdy locking mechanism, made of hardened steel and designed to securely fasten the shackle to prevent unauthorized access.Weather Resistance: Alarm padlocks are designed to be weather-resistant.The inner body is brass and the outer body is plastic and hardened Iron Shackle.Alarm System: The alarm is triggered by various actions, such as vibrations, movement, or attempts to tamper with the lock.Power Source: alarm lock for doors are battery-powered.The power source are replaceable batteries, One set of extra batteries is provided with the pack.