Auto alarming and locking system, elastic bumper scratching, waterproof, resistant to salt and harsh weather, aluminium material, light weight. It can be fixed into bicycles even you ride the bicycle and also has anti-rust strong material / electroplated / hot processed / hardened shackle / corrosion resistant. Two functions, anyone can keep it as a normal bicycle lock, and set it as an alarm lock. It can be used on door / windows / bicycle / container / motorbike and tricycle. The lock has 233 x 70 x 34 mm dimension.