Cool LED LightAdopting high-grade led light source with cool light, so it is very helpful for you to watch the growth of the fertilized eggs, and you can check about once or twice a week to make sure that they were still growing. Premium MaterialsMade of high quality ABS material, safe, insulating, stable and durable to use. With buttons that are easy to open and close. Exquisite workmanship and fine treatment ensure its extra durability. Upgrade VersionTwo charging methods, can be directly charged by USB, also equipped with a battery box, requires 3AA battery(Not included), battery box power supply, can be selected according to the needs of use, very convenient. ApplicationsThe battery operated egg candler tester is not just for hatching eggs, it is also suitable for kids and students to learn the incubating process. Suitable for school funny class or school laboratory. Perfect PartnerPerfect for lighting chicken, duck or goose egg in each incubation stage. Use with incubator, effective guarantee of hatching success rate, worthy of your choice.