This is a bike lock which has a four digit combination lock on it. It also has an LED light in it which means that you can light up the combination part and see it more easily when you are unlocking your bike in the sark. The light automatically goes off after 15 seconds so you do not have to worry about remembering to switch it off. It has a steel cable attaches which has cut resistance and a PVC coating to stop scratches which is 0.2m at full stretch. The length means that it is ideal for winding through the wheels of a bicycle and securing it to a rack, post or drainpipe.