This is a great bike lite for the money! It has a super bright light which can be seen from a long distance,and gives great illumination even on the darkest nights where there are no street lights.It didn't come with any instructions which usually isn't a problem,but when you want to insert batteries into the light,it is very important that you insert them through the rear of the light and not through the front!! I made this mistake and damaged one of the spring contacts on the battery hub when I was unscrewing the front of the lamp,so I had to order another one.So just to recap, batteries in through the back of the light,Not through the front!! Hope this will help somebody!!