Usage: ?Put 2 AAA Batteries & 1 AA battery (not included) respectively in keyboard and mouse. ?Take out the receiver from the keyboard, plug in computer USB 2.0 port. ?Flip the switch to power on (on the mouse). Specification: Item Name: Wireless Keyboard and Mouse Combo MK221Number of Keys: 96Key Switch Type: Typewriter Style Round Keycaps Key Backlighting: NoneMaterial: High-End ABS Compatible: Windows2000/ME/XP/(X-64)/Vista7/8/10/Mac OS X (Above V10.4) Interface: USB 2.0Transmission Distance: 10m/33ftOperation Voltage?5VOperation Current?<20mAService time: ?10 Million Strikes Battery:2 AAA & 1 AA Batteries (Not Included) Optical Resolution: 1600 DPI Number of Keys: 96Hotkeys:12Features: Wireless, Plug and Play, Slim Mouse Size: 6.1cm x 10.7cm x 3.8cm/2.4" x 4.3" x 1.5" (Approx.) Keyboard Size: 38.4cm x 14.3 cm x 2.3cm/13.7" x 5.6" x 0.7" (Approx.) Colors: Mint Green, Baby Pink, Pearl White, Midnight Black Package Includes: 1 x Wireless Keyboard 1 x Wireless Mouse 1 x Nano USB receiver (stored inside mouse) 1 x Mousepad Free Gift 1 x User Manual