Features: Combines locking function with alarming function. Made of quality aluminum alloy, corrosion resistant, waterproof and durable to use. Built-in siren device with loud alarming sound up to 110db, perfect for avoiding theft. Mini appearance, it's convenient to carry anywhere you are heading to. Comes with 2 keys. One is for use and the rest is kept ready. Suitable for most motorcycles, bicycles, doors, windows an so on. 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 modeSpecification:Condition: 100% Brand NewMaterial: Aluminum alloyColor: BlackSize: As picture shownAlarm volume: 110dbUnlock mode: Key Application: Door, Window, Bicycle, Motorcycle Package List:1 * Lock6 * Batterry2 * KeyNotice: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.