This high quality egg tester is made of high quality ABS material, insulating, stable and durable. High intensity lamp to monitor egg development. LED lamp head, high power, strong light source, can clearly detect egg hatching. Fast, extremely simple, durable safety with easy to put on and take off button, for years of use. Suitable for egg closion, but also for children and students to learn the experiential incubation process. This egg shaped candle holder offers high intensity LED light for ultra safe lighting for your children. eggs, avoiding damage to the development of the attack. Type of upgrade: two charging methods, can be directly charged by USB, also equipped with a battery box, requires 3 AA batteries , battery box power supply, can be selected according to the needs of use, very practical.