GenuineLogitech Replacement USB Receiver for WirelessPresenter R400&R800 R400 / R800 Receiver The presenter R400 has M/N: R-R0008 and the presenter R800 has M/N: R-R0009. The receiver to be used is with M/N: C-U0014 Works with these products: Professional Presenter R800, Wireless Presenter R400 USB receiver needs to be paired with the Presenter before using. Insert shows pairing instruction. Pairing instructions are also widely available in the internet.