State-of-the-art, play-and-play technology allows our response systems to be highly transportable thanks to our USB receiver. Radio frequency technology ensures that response s are received accurately, timely and effortlessly to the presenter. With a 200 foot range (400 foot coverage), the RF Receiver works flawlessly with ResponseCard RF, RF LCD and XR. Approximately the size of a thumb drive, the receiver doesn't require the hassle of cables or other complicated technology. Move the system from room to room with ease.