M-Wave bicycle alarm This bicycle alarm from M-Wave works by means of a motion sensor and produces a sound of no less than 120 decibels. When touched, the alarm first beeps 5 times, the code must be entered within 5 seconds. The sensitivity can be set, so it does not go off just like that. Specifications: Total length: 60 mm Total width 90 mm Clamp diameter: 25 - 30 mm Sound volume: 120 decibels Weight without battery: 84 grams Material: plastic Color: black Contents: 1 Bicycle alarm 1 Battery