Usage Tips:ADJUSTABLE SENSITIVITY: These electronic fishing bite alarms are designed to alert you when a fish is hooked. The sensitivity of the fishing alarms can be controlled by adjusting their angle, which helps to exclude the effects of strong currents and wind. When fishing with more than one rod, these are very helpful in knowing which rod is a hit. Package. Fine workmanship and perfect style. LOUD AUDIBLE ALARMS: a fish bites, the fishing alarm will sound an 80-decibel volume to your attention. You 't miss a single fish even if you're a hundred meters or with other things. Note: Volume is not adjustable. WIDE APPLICATIONS: The space of the fishing bite alarm clip is 0.4in/1cm, it can be used for many different types of rods, except for rods that are too thin. They are suitable for sea fishing, ice fishing, fly fishing, bass fishing, trout fishing, kayak fishing and pier fishing in different terrains. What a great gift option they are for fishing enthusiasts! High Wear-resistant and durability. Colour: Black Material: ABS Package Contents: 4 * Fish Bite Alarm 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.