GTRS Wireless Audio Interface Receiver for Audio Internal Recording or Live Streaming GWR4 is the tool that enables wireless recording of audio or video. Used in conjunction with the GWU4 it allows for a virtually lossless transfer of guitar sounds directly to the recording device. The UHF technology and low-noise circuit design provide stable signals, low noise and low signal loss, and an effective transmission distance of up to 20 meters Brand Name GTRS Audio Input USB Manufacturer GTRS Item Type Name Audio Sampler Operating System Linux, Windows, macOS Compatible Devices Electric Guitar, Personal Computer, Guitar, Tablet, Laptop, Smartphone Number of Channels 1 Warranty Description 1 year warranty.