Secure and alarm your bike and gear in seconds with this versatile cable-and-alarm combination. The ultra-hard 3mm plastic coated cable resists cutting and sawing, but if it ever becomes broken by any method, the loud 120 decibel siren instantly shrieks...and it will be heard a long way away. The steel alarm housing comes with a wall bracket that can be permanently installed at home or work parking areas...but this compact alarm system is also perfect for travel. The electric alarm circuit conducting cable is long and flexible enough to thread through multiple bikes and piles of packs and gear in seconds. Requires a standard 9v battery (not included) An Aero/RWH exclusive. 3"×5.5"×2.5". Cable/Chain Comparison (w/ and w/out locks)