Plug&play:The wireless number pad and mouse combo use latest 2.4GHz wireless technology, just Plug and Play！No drivers need to be installed. Numpad & mouse share ONE USB receiver. Do not occupy other USB port. NOTE: The USB Receiver is inserted in the battery compartment of the mouse.19 Keys Laptop Number Keypad: Professional 19 full-size and concave keys design for accounting files or financial applications, including the "00" key, can comfortably input and increase productivity .It also has auto sleep function, lower power consumption, reflect energy saving. Press any key to awake up the keypad.(It will auto power off when not in use for 10 minutes, effectively increase the battery life.)3-Level Adjustble DPI Mouse & Noiseless Click Mouse : 3-level DPI settings (800/1200/1600) to meet your multiple needs. Add a power switch button on the mouse. It enters into sleep mode automatically, energy saving, extended battery life.The slim wireless mouse with high sensitivity gives whisper click without disturbing others. Up to 1000000+ clicks.Great wireless mouse for home and office. Power Supply by 1 x AA Battery ( not included )Easy to use & Portable Design: Using latest 2.4 GHz Wireless technology, plug and play, no device drivers, signal transmission stability, almost no delay, working range up to 32.8FT.Ultra-slim and wireless features give yourself a great option to travel anywhere with a numeric keypad for your laptop.Numeric keypad Compatibility :The wireless number keypad and mouse combo work with laptop, notebook, desktop, PC computer. Compatible with Windows 2000 / XP / Vista / 7 / 8 /10/11 operating systems. NOTE: This usb keypad is not fully compatible with Mac OS system,the function keys do not work while the number part 10 keys work fine.