Features: Sound-light alarm device Portable 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. Dimensions:3.03 x 2.17 x 1.57in/7.7 x 5.5 x 4cm(L x W x H) Battery: 3x LR44/AG13 button cell Material: Plastic. Color: Black Package Weight: 50g Package Included: 1 x Fish bite Alarm 1 x Anti-slip mat 3 x LR44 button battery