Black 3D 2.4G USB Optical Wireless Mouse Operation systems:Windows 2000,Me, ... 2402-2480MHzRF operation channel: 16, auto frequency hoppingUSB: USB 2.0Operation systems: Windows 2000, Me, XP, Vista, Win ... size: 201*100*56mmPackage weight: 120g Package including:1 * Optical Wireless Mouse 1 * USB receiver Other similar items 1. ... do not know about them! Black 3D 2.4G USB Optical Wireless Mouse 1600dpi