1. Alarm mode: Rotate the lock beam at 180°and press it, you will hear the "di" sound prompt, the alarm mode is on. In this mode, if an external force touches the lock body, the lock will emit a harsh alarm sound.
2. Normal mode: Reverse the lock beam at 180° and press it again, there is no "di" sound prompt, normal mode is on. No alarm sound in this mode

Specification:
Condition: 100% Brand New
Material: Aluminum alloy
Color: Black
Size: As picture shown
Alarm volume: 110db
Unlock mode: Key
Application: Door, Window, Bicycle, Motorcycle

Package List:
1 * Lock
6 * Batterry
2 * Key

Note:
1. Please allow 0-1 inch error due to manual measurement, thanks for your understanding.
2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.