110dB Smart Waterproof Password Bicycle Lock Anti theft Alarm Lock Batteries Not Included Features: Alarm immediately when shaking or moving the lock. Alarm immediately when cutting steel ropes or removing lock screws. Alarm immediately if you mistype your password three times. The pulled wire rope can be used as a defensive whip.  The sound of alarm is over 110 decibels, which can effectively deter thieves. Wire rope diameter 10 mm, length 80 cm. Four-digit passwords with 256 groups of password combinations.  Lock/unlock button operation, no key required.  Three AAA batteries are powered by standby mode for more than 8 months and have low power indication function. IP44 waterproof certification, suitable for indoor and outdoor use.  Can be used normally at temperatures ranging from - 20 to + 60 ℃. Specifications: Power Supply: Three AAA Batteries (Not Included) Battery life: Standby mode, about 8 months or more Size of steel rope: diameter 10 mm, length 80 cm Working Temperature: -20 ~+60 ℃ Storage Temperature: -30 ~+80 ℃ Size: Approx. 9.2 x 5.5 x 3.4cm/3.6 x 2.2 x 1.3in Package Weight: 292g/10.3in Package List: 1 x Lock (Battery Not Included)  1 x User Manual