The Urban 999 alarm brake disc lock is hi-tech security SRA homologated (scoring 19 out of 20) and made from high-strength forged steel with a double 14mm diameter lock. The innovative double-locking system locks the shaft on the lock side and the base to double the resistance to possible attacks. It can be used with or without the 120dba alarm (and is easy to switch off) and offers a warning system. If the motorcycle is touched 6 warning beeps are triggered - if left alone it stops reducing battery drain. This also means no reminder cable is necessary. It offers A+ sensitivity for optimum reliability. The CR2 long-life lithium battery does not lose charge in the cold and is easy to replace when needed - usually after two or three years of use.