To customers: life is full of surprises. Package Includes: 1 x Lamp Holder 2 x Big and Small Bases 1 x Cr1225 Lithium-battery ( Button Battery ) Item Name: Fishing Bite Alarm Material: ABS Size Details: Size: 2.95cm x 2.5cm x 1.73cm Specifications: There are two luminous colors, which will allow you to easily distinguish between the waiting state and the state with a hook. The product will immediately turn to green light and flashes quickly when there is a fish bite, which is able to remind you to lift the rod to collect the fish in time. The product will slowly flash red light when it is an adaptive static state, which is able to make you see the position of the fishing rod plain. Made of high quality ABS, it is lightweight and waterproof. The product is easy to install, and it is equipped with CR1225 lithium-button-battery, which can be used immediately after getting it. The length of the product is 2.95cm, the width is 2.5cm, the height is 1.73cm. It is suitable for fishing lover.After the product is locked, it will be automatically powered on, and it will automatically be powered off when it is removed. There is no need to remove the battery. It is very easy to use. Notes: When receiving the goods, the battery is upside down, please turn it over when you use it. 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. Wefor excellence. And hope you have a nice day!