Power Source:Solar, Battery Powered Operating System:Windows XP Are Batteries Included:No Item Weight:190 g Guaranteed software updates until:unknown Description: This wireless numeric keyboard with clear LCD display is multifunctional. It can be used as a calculator as well. You can freely switch the two modes (numeric keyboard / calculator) by pressing the PC/CAL key. When used as a calculator, it is solar powered. While when used as a numeric keyboard, you should put in 2 AAA batteries. It can perfectly compatible with your devices that don't have a special numeric key and improve your work efficency. Specifications: Color: Black Material: ABS + Metal Connection: 2.4G USB LCD Display Size: Approx. 77 * 22 mm / 3.0 * 0.9 inch Number of Keys: 29 Battery: 2 * AAA Batteries (NOT included) Solar Panel Voltage: 3V Solar Panel Current: 3mA Compatibility: Windows xp / Vista / 7 / 8 / 10, Mac OS 10.3.9 and above. Package Weight: About 190g Package List: 1 * 2-in-1 Numeric Keypad Keyboard 1 * USB Receiver 1 * User Manual(Other items in the pictures are not included.) About this item LCD display and USB receiver: 2-in-1 Numeric Keypad & Calculator with LCD display and USB receiver PC/CAL key: Specially designed with PC/CAL key. You can switch and use it as wireless numeric keyboard or calculator freely Solar powered (must in the sunlight): no need to load battery when ONLY use it as a calculator. If you use it as a numeric keyboard, you should put in 2 AAA batteries(not included) Small size. Compact and lightweight. Strong and durable. Portable and sturdy 29 keys design: Moderate size, ideal for office. Effectively improve your work efficency See more product details LCD display and USB receiver: 2-in-1 Numeric Keypad & Calculator with LCD display and USB receiver PC/CAL key: Specially designed with PC/CAL key. You can switch and use it as wireless numeric keyboard or calculator freely Solar powered (must in the sunlight): no need to load battery when ONLY use it as a calculator. If you use it as a numeric keyboard, you should put in 2 AAA batteries(not included) Small size. Compact and lightweight. Strong and durable. Portable and sturdy 29 keys design: Moderate size, ideal for office. Effectively improve your work efficency