Sunreed 2in 1 USB Numeric Keypad with Calculater Wireless Receiver Numeric Keypad Tablet with USB Hub 29 Keys for Microsoft Mac Vista Win 7 8 Xp 2000 Tablet Laptop Numeric Mac Wireless Tab 29 keys,2.4G mini wireless numeric keyboard, 25 feet from the computer,can be used either as a calculator or as a remote numeric keyboard for the computer Four rubber feet on the bottom keep it firmly in place,10 digit LCD screen is large and very easy to read With Solar Power,you don't need battery when you use it as calculator,if you use it as numeric keypad,must intall 2pcs AAA battery in ( NOT INCLUDE IN THE PACKAGE).Press"CONNECT" key to connect it to the computer,press"SEND"key to send the calculate result to PC For connect it to your computer,connect the USB dongle to your computer. Press the blue connect and you will see a wireless connection symbol appear. Press the PC/CAL button and a K will appear in the upper right portion of the LCD display. Package include:1 x pocket calculator numeric pad + 1 x USB Receiver,Need 2pcs AAA battery, not include in the package.