Power saving,and three button cell are required,it can be in use for a-long timing the batteries is take down when in use. Portable and easily installed,damage to fishing lines.Easy-to use,you can use the clamps on the rod,but also prompt light. The outer layer,sealed without bolts,fish alarm is of firm and ABS.Sound-light alarm device. As long as the fish will pull a sound and light alarm,therefore even angler fall-asleep,and the light fish baits will prompt tip. It is very sensitive to fish which swallowing the baits.Usable with different kinds of rod in different terrain and weather.