2.4 GHz wireless connection: A nano-receiver connects both the keyboard and mouse using just one USB port;Pencil-thin,Low-, whisper-quiet comfortable and typing. Hot keep access to applications and media control ; button adjusts the sensitivity of the mouse between 3 levels (800/1000/1200).The Nano-receiver can be found in the battery compartment of the keyboard/mouse.Requires 4 AAA batteries (2pcs for mouse, 2pcs for keyboard) , batteries NOT Included.Only support the English Layout.Keyboard size: 280x130x20mmKeyboard weight: 300gMouse size: 113x57x23mmKey: 78 Battery type: Using AAA battery(not included)Interface: USB 2.0Operating range: 10 How to use:1. Open the package box, then take out the keyboard and mouse.2. There is a battery compartment in the bottom of the keyboard, then open the battery cover, you will see a USB receiver inside, take out it and insert the device you to connect.3. After take out the usb receiver, then put 2pcs AAA batteries inside the compartment with setting.4. For mouse is same with the keyboard, there also a battery compartment on the back of the mouse, open the cover and put 2pcs AAA battery too with setting.5. With USB receiver connect succeed, you can enjoy the keyboard and mouse now!Colour: goldMaterial:ABS plasticPackage Contents:1 x Wireless Keyboard1 x 2.4G Receiver1 x mouseOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.