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 the bait This LED Light Alert is the perfect indicator for night fishing Battery: 3x LR44/AG13 button cell Material: Plastic Color :Black Dimensions:45mm*15mm*7mm Package Contents: 1 * Fishing siren 1 * Transparent plastic box packaging Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.