1. The product is composed of ABS shell electronic components, which has stable performance and long service life. 2. The product is packaged and shipped in electrostatic bags, and the delivery is loose parts, which need to be assembled by customers. 3. This is the 1 calculator electronic production kit, It is suitable for welding exercises, electronic training experiments and other purposes. It is very suitable for DIY enthusiasts and can improve their hands-on ability. 4. The product is light and compact after assembly, it make you feel a sense of accomplishment, and you can use it anytime and anywhere. 5. Customers can choose to use it without button batteries or with button batteries. The number of button batteries is 2 Product parameters: product name: calculator electronic DIY kit adapter battery: CR2032 x 2 (button cell) display model: LCD1062 Note: This product is suitable for electronics enthusiasts to research and repair circuit products. We only that the product is in good condition before delivery, and cannot success after installation. Please read the instructions carefully before payment. Material: plastic colour: Black Package Contents: 1 x Calculator Making kit(DIY parts delivery) 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.