The Oxford Products Alarm Chain 10 LK131 combines a 10mm square link chain with a loud 90dB alarm. It features a robust, hardened steel construction with a flexible cloth sleeve to protect your paintwork with a 2-year warranty. It comes with 2 x CR2032 batteries included and three keys. It also offers a replacement key service from Oxford Products and measures 10mm square chain x 1.5 metres in length.