... 1. Wireless with 2 batter 3.High quality 2.4GHz Wireless Mouse Portable Optical Mice RF USB Receiver Adapter Laptop PC LF-0794* 2.4GHz wireless transmission up ... RF operation channel: 16, auto frequency hopping * USB: USB 2.0 * Operation systems: Windows 2000, Me, XP, Vista, Win ... 7 * Power: 2 * AAA battery * Rated operation current: 15mA, 1.5V * Color: ...