Bike lock with a 4-digit combination code. Adjustable personal security code. Built-in siren with 90 dB. Cable automatically retracts at the push of a button. Weight: 84 g. M-Wave is a manufacturer of high-quality bicycle accessories, developing products for cyclists by cyclists based on years of experience. The practical Lock'n'Roll Alarm retractable cable lock from M-Wave is a true all-purpose tool with an alarm function. If the lock is moved or the cable is cut, the lock sounds an alarm at a volume of 90 dB. The sensitivity is adjustable. You can set your personal security code on the 4 different dials and change it at any time.