From Manufacturer
The Relay G10 Digital Wireless Guitar System from Line 6 lets you cut the cord between your instrument and your amp by combining uncompressed digital transmission, plug-and-play simplicity, and protection from interference, in a simple and intuitive amp-top package. It is ideal for electric and acoustic guitar, bass, and any other instrument with a high-impedance output.
The system comes with a 1/4" transmitter that plugs directly into your guitar, and a receiver that sits on top of your amplifier. The transmitter eliminates the need for a bodypack and its associated cable. The system will automatically find the cleanest frequency. Neither setting up nor scrolling through complicated menus are required. The system offers 24-bit uncompresed signal over the 2.4 GHz range for minimal interference over a range of up to 50' line of site. The transmitter has a battery life of 8 hours and is rechargeable. The system is FCC compliant and requires no license to operate.