Product Name : Auto Lock;External Material : Metal Main Color : Gray;Wire Quantity : 3 Power : DC 48V;Lock Dimension : 7 x 4.5cm / 2.8" x 1.8" (L*D) Mounting Hole Dia : 19mm /0.75";Cable Length : 12cm/4.7" Weight : 124g;Package Content : 1 x Auto Lock2 x Keys Designed with a reliable switch locking mechanism， make your bike car more safety. For electric bicycle， bike security.