... .Adapt high-tech integrated circuits and digital se bike alarm lock,alarm lock,bicycle alarm lock Insert key and turn to open ... times a warning tone. Feature(1).Used on: Fit for bicycle, motorcyle, electrombile,door and so on.(2).Design Principles: Adapt ... .3.Change batteryOpen the lock, please dismantle two 5mm screws with a screwdriver, open the cover, and then put the batteries ...