Description: After the product is locked, it will automatically power on, and it will automatically power off when it is removed. You don't need to take out the battery. Using smart sensor design, the light does not turn on when the product is powered on, and the red and green lights flash alternately for 15 seconds after the fish bites the hook. Made of high quality ABS, it is durable and easy to use. The product is compact in size, light in weight and easy to carry. 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. Item Name: Fishing Bite Alarm Material: ABS Batteries: CR1225 Lithium-button-battery ( Included ) Visible Distance: 100m Size Details: Size: 2.95cm x 2.5cm x 1.73cm/1.16" x 0.98" x 0.68" (Approx.) 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. Package Includes: 1 x CR1225 Lithium-battery ( Button Battery ) 2 x Big and Small Base 1 x Lamp Holder