Features: for Unifying Mouse or Keyboard:for Anywhere Mouse MX (M905),M325,M585,M510,M705for Performance Mouse MX (M950)for K400 keyboardfor Wireless Solar Keyboard K800for Number Pad N305for Wireless Trackball M570. Download Unifying software to quickly add all of your devices to one receiver. For easy mobility and exceptional experience, keep a mouse-and-keyboard at work, at home and in your computer bag. They are for always ready to use from only one USB port. It's convenient, clutter free, advance 2.4 GHz wireless technology. One-to-many connection: One tiny receiver for up to six Unifying devices. Plug it and leave it, then connect additional mice and keyboards to one computer. Specifications: Mode: Single channel Device(14),6 Device(28) Type: Receiver for Unifying Material: ABS, metal Size: approx. 1.4x1.8x0.6cm / 0.5x0.7x0.2in Quantity: 1pc Note: Single channel Device only supports connect Utility,Unifying does not work. 6 Device only supports connect Unifying. We have two models to choose from: single channel device and 6 channels device. Single channel device can only connect mouse, 6 channels device can connect mouse and keyboard at the same for time. Package includes: 1 x Receiver