Simple structure, easy to install.Quiver style alarm.95db high export sound.Have the functions that the anti theft lock can not substitute.Protect the bike lock from destroyed and prevent the behavior of moving the bicycles by the thief.Password or remote function convenience to use avoid key switch weakness which easy to open with other key.Item Name: Bicycle Alarm LockMaterial: PlasticPowered by: 9V Battery(Not Included)Features: Anti-theft, Easy to Use, Vibration AlarmSize: 9.8cm x 3.7cm x 6cm/3.86" x 1.46" x 2.36" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Bicycle Alarm Lock1 x Remote Control2 x Screws