Feature: 1. Palm Rejection: ON key sunken design, anti error touch, reduced protruding amplitude to prevent erroneous touch clearing during computing. 2. Split Design: Navigation key upgrade, split design to prevent errors, protective cover upgrade, two way slide cover. 3. Battery Powered: Function calculator is battery powered, only one AAA battery is needed for simple installation. 4. Clear Numbers: Comfortable plastic keys, key text wear resistant treatment, clear numbers, light keys. 5. Applicable Scenarios: Black scientific calculator is suitable for junior high school to college, no storage memory, suitable for taking into the examination room. Specification: Item Type: Scientific Calculator Material: Plastic Product Specifications: Black Power Supply: AAA Battery (Ship with Inbuilt Battery) Battery Capacity: 900mAh. Package List: 1 x Scientific Calculator (Ship with Inbuilt Battery)1 x Lid