Features: 1.When an abnormal situation occurs, the anti?theft lock will emit a sound of up to 110 decibels to protect your beloved motorcycle from being stolen. 2.With vibration function, sensitive motion vibration sensor can send out an alarm to scare away the thief. 3.Press the lock button and the brake lock will immediately enter the alarm mode. When vibration is detected, it will issue three times "beep" warnings, if it is triggered again, it will emit a sharp alarm lasting about 10 seconds. 4.Built?in 4 feet/1.2m disc lock reminder cable, orange reminds you to remove the disc lock to prevent potential damage to the disc lock due to riding during use. 5.Made of high?quality alloy steel, with the advantage of waterproof, dust?proof and dirt?proof. 6.Widely used, suitable for most motorcycles and bicycles with disc brakes. Specification: Condition: 100% Brand New Item Type: Wheel Disc Brake Lock Color: As Pictures Shown Material: Alloy Steel Size: Approx. 90x80x60mm/3.5x3.1x2.4in Battery: 6pcs Built-in button battery(Model: LR44, Capacity: 150MAh) Application: Suitable for motorcycles and bicycles with brake disc thickness less than 6mm Features: 110db alarm/waterproof/anti-frivolous Battery Replacement: When you hear the low-battery beep or the alarm will stop in less than 10 seconds, which means that the battery will be out of power and you need to replace the battery. Please use the small wrench provided by us to unscrew the four-pin screw at the bottom, remove the casing and replace the battery. Note the positive "+" and negative "-".