Sound-light alarm device has maximum volume up to 80dB.The three batteries equipped can be in use for 1 or 2 years if the power is turned off when in no use. This fishing alarm bell will not cause any damage to fishing line. It is very sensitive to fish which swallows the bait.The outer layer sealed without bolt, and it is made up of sturdy and durable ABS.The length is approx 6cm.It is compatible with different kinds of rod in different terrain and weather.Item Name: Fishing Bite AlarmMaterial: ABSBatteries: 3 x AG13 Button Cells (Included)Size Details: Length: 6cm/2.36" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Bracket1 x Fishing Bite Alarm