1. Material: plastic
2. Power supply: battery (including a 1.5V button battery) + solar
3. Display digits: 12 digits
4. Computer keyboard design, concave key surface, stable feel
5. Large plus key, high-travel light-touch conductive adhesive, easy and accurate key press
6. Clear large-screen display, easy and convenient operation
7. Memory storage function, easy to retrieve data
8. Size: about 19x15.4x4.3 cm
