The keyboard and the mouse are all powered by 2 x AAA battery ( not included ). The receiver is shared by the mouse and keyboard.                 <strong>Type:</strong> Keyboard and Mouse <br />             <strong>Features:</strong> Mini, Slim <br />             <strong>Color:</strong> White                               <strong>System support:</strong> Windows 7, Windows Vista, Mac OS, Windows XP, Windows 2000 <br />             <strong>Interface:</strong> Wireless <br />             <strong>Connection:</strong> Wireless <br />             <strong>Receiver:</strong> With <br />             <strong>Operating Voltage:</strong> DC 3V <br />             <strong>Operation Current:</strong> 6mA <br />             <strong>Power Supply:</strong> 2 x AAA Battery                               Array             <strong>Package weight:</strong> 0.502 kg <br />             <strong>Product Size (L x W x H):</strong> 28.5 x 13.2 x 1.8 cm / 11.20 x 5.19 x 0.71 inches <br />             <strong>Package Size (L x W x H):</strong> 29.5 x 14.5 x 2.5 cm / 11.59 x 5.70 x 0.98 inches                               <strong>Package Contents:</strong> 1 x Wireless Keyboard, 1 x Wireless Mouse, 1 x Nano Receiver for Mouse and Keyboard                 <img alt="Multi-function 2.4GHz Wireless Keyboard and Optical Mouse Kit" src="//agdetail.image-gmkt.com/m430/561/176/599176561/img/agdetail.image-gmkt.com/561/176/599176561/img/des.chinabrands.com/uploads/2014/201410/heditor/201410081119084043.jpg" />