M-Wave bicycle alarm This M-Wave bicycle alarm goes off when the lock is started or if the cable is broken. The sensitivity can be adjusted, so it doesn't just go off. Specifications: Cable length: 600 mm Cable thickness: 2 mm Total length bicycle alarm: 85 millimeters Total width bicycle alarm: 60 millimeters Weight: 84 grams Material: plastic Color: black Sound level: 90 decibels With 4-digit individual security (changeable) Contents: 1 Bicycle alarm 4 LR1154F batteries