SIENOC USB PC Remote Control Windows Media Center Color White Wireless mouse functions;Number input;Multimedia controller Page up/down;E browser short-cut key;Remote controller Control distance: 18M;Battery: 2 x AAA ;Working voltage: 2.4~3.5V Receiver;Hardware: IBM PC/AT&Notebook, Apple;Operation system: Windows98/SE/ME/2000/XP/Vista/windows7 32bit/ 64bit; Linux; Mac Compatible port: USB1.1/USB2.0;Working voltage: USB electricity supply (4.5~5.5v)