Closed design, so the fish trap light has no water ingress. The built-in battery can be used directly. The exposed contact point is designed to light up when it touches the conductor, which is convenient and quick. Comes with double rings, the fish trap light can be used with a wide range of applications. Made of high quality acrylic and metal material, it is sturdy and durable. Length of this fish trap light is 1.7cm, width is 1.2cm, height is 1.2cm. It can be used as underwater fishing lights, and you can lure the fish to approach the light source. Item Name: Lure Trap Light Material: Metal,Acrylic Batteries: 2 x Button Batteries(Included) Size Details: Size: 1.7cm x 1.2cm x 1.2cm/0.67" x 0.47" x 0.47" (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 Fish Trap Light