Feature: 1. LARGE ROUND KEYS: The 28 keys calculator is made of ABS material imitating a mechanical keyboard with large retro round keys that are comfortable to touch and easy to press with your fingers. 2. DUAL POWER SUPPLY: This calculator has both solar and battery power supply modes, which can be recharged by solar energy when there is light, no need to replace the battery. 3. 12 DIGIT DISPLAY: The retro calculator features a 12 digit LCD display with specially formulated pigments to improve the clarity of the display and make it easy to read. 4. BEAUTIFUL AND EASY TO USE: This calculator has the right size and is designed to lay flat on a desk, countertop or table for easy access, beautiful and convenient. Lightweight and portable. 5. MULTIPLE APPLICATIONS: Desktop calculator is suitable for office, business, school students, stores, malls, daily and home scenarios, you can also give it as a practical gift to friends, students. Specification: Item Type: Dual Power Calculator Material: ABS Battery Type: 1 x AAA Battery (Not Included) Support: Solar Power Keys: 28 Keys Wide Screen Display: 12 Digits Auto Shutdown: Intelligent Shutdown . Package List: 1 x Dual Power Calculator