COOL Light,No Heat Damage the Eggs: Egg candler provide cool and strong light, no heat damage to egg embryo and for monitoring egg development. Easy to Use: Handle design ,more humane, design with and off button. and Work for Long Time: If you are worry about some place no power or inconvenient to use Power Cable,This type is fit ,Charge one time can use 24hours.(This data is measured by laboratory. The actual charging and operating time can be different.) Two Candler Covers: Our Egg Tester come with two rubber candler covers that cover about all kinds of egg types. Portable & Convenient: This candler can be used directly after charging without plugging in which is easy to carry and can be used indoors or outdoors. Colour: white Material: plastic Package Contents: 4 x Egg Candler Tester 4 x usb charging stand 8 x rubber candler covers 4 x battery Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.