1The shell made of high quality ABS material, waterproof and eco-friendly, non deformation, solid and durable to use. 2The battery is cannot replace, but it can last up to 80-90 hours, has enough life time to service you. 3It will automatically turn off the light when it is removed from water, effectively saving the battery life, very convenient and practical. 4The shining light is great to attract fish, make you more easier to catch great quantities of fish, improve efficiency and save time. 5It's a helpful fishing tool for fishing enthusiasts, a perfect accessory for fishing.