NEW for Unifying USB Receiver USB Dongle Secure 6 Multi-Device Original usb dongle adapterFeatures:for Unifying Mouse Keyboard:for Mouse MX (M905)，M325，M585，M510，M705for Performance Mouse MX (M950)for K400 keyboardfor Solar Keyboard K800for Number Pad N305for Trackball M570.Download Unifying software to quickly add all of your devices to 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 USB port.It's convenient, clutter free, advance 2.4 GHz technology.One-to-many connection: tiny receiver for up to six Unifying devices.Plug it and leave it, then connect additional mice and keyboards to computer.Specifications:Mode: Single channel Device（14），6 Device（28）Type: Receiver for UnifyingMaterial: ABS, metalSize: approx. 1.4x1.8x0.6cm / 0.5x0.7x0.2in Quantity: 1pcPackage Includes:1 x ReceiverNote: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.