Package Include:1 x Disc Lock2 x KeySpecifications:Features:- Durable no rust: the outer layer of the lock cylinder is 3mm steel plate, so that electric drill, reamer no way to start, to ensure the safety of the lock cylinder.- Use keys to turn on/off alarm device.- Pressed by hand can be unlocked, without keys, safe and convenient.- Waterproof rustproof tamper appearance more refined.- No edge of the streamline design to avoid harm yourself.- Built-in battery: with 6 AG13 batteriesHow it works: - When the key through the key slot, insert the bottom will be able to press the alarm switch, hear the "Beep" sound, said the alarm has been set successfully, once again touch the lock will have an alarm sound, insert the key again cancel the alarm.Material: Zinc AlloyType: Disc Brake Alarm LockBolt Diameter: 8mmColor: Silver