Features:Sound-light alarm devicePortable and easily installed.The outer layer、 sealed without bolt、 is made up of sturdy and durable ABS.Usable with different kinds of rod in different terrain and weather.Power saving. The three batteries equipped can be in use for 1 or 2 years if the power is turned off when in no use.No damage to fishing line. it is very sensitive to fish which swallows the bait.This LED Light Alert is the ideal indicator for night fishing.Material: Plastic.Dimensions:3.03 x 2.17 x 1.57in/7.7 x 5.5 x 4cm(L x W x H)Package Weight: 50gBattery: 3x LR44/AG13 button cell (included)Package Included:1 x Fish bite Alarm1 x Anti-slip mat3 x LR44 button battery