UPGRADE DESIGN：This candler can be used directly after charging without plugging in which is easy to carry and can be used indoors or outdoors. UPGRADE BUTTON: The switch button is set on the top of the candler, which is more suitable for the use of hands. Candler won't shake by pressing the button NO HEAT DAMAGE TO EGGS: Our egg candler provide cool and strong light, no heat damage to embryo and perfect for monitoring egg development TWO CANDLER COVERS: Come with two rubber candler covers that will cover everything from large duck eggs to tiny quail eggs USE FOR LONG TIME: Charge for 3 hours, continuous use for 6 hours. (This data is measured by laboratory. The actual charging and operating time can be different.)