This product is equipment that allows you to listen to the sound sources of each instrument through a PA system and collectively through headphones or earphones when you enter a studio for band practice. You can also listen directly through earphones or headphones via an amplifier during individual practice. I think it would be good to use it when creating the sound quality of guitar effects. Thank you for your consideration. * Brand: LEKATO * Connectivity Technology: Wired, Wireless * Color: Transmitter White, Black, Receiver Green * Connector Type: Wireless * Receiver x1, Transmitter x2 Can transmit to 2 instruments. * Rechargeable batteries are included, but they have not been used and are as they were when purchased. * Purchased for practice purposes, but have not been used, only opened. * 【High-Quality Sound】Provides studio-quality audio, achieving clear and rich tones. It excels in reproducing high and low frequencies, ensuring professional sound quality even during live performances and recordings. This allows for smooth musical communication with the audience and other musicians. * 【Wide Transmission Range】Has a communication range of up to 25 meters, and can reach even further in environments without obstacles, allowing for confident use on large stages and in spacious rehearsal rooms. This allows artists to move freely and concentrate on their performance. * 【Low Latency Technology】Audio delay is less than 12 milliseconds, enabling real-time feedback. This allows for accurate timing during performances without feeling any delay while playing. It provides a stress-free experience, especially in music production and live performances. * 【Multiple Connection Function】One transmitter can connect to multiple receivers simultaneously. This allows band members and other performers to share audio, improving convenience in group performances and sessions. * 【Mono and Stereo Function & Rechargeable Battery】You can switch between mono and stereo modes with a single button, accommodating various usage scenarios. Furthermore, the built-in rechargeable battery allows for up to 5 hours of use on a full charge. This allows for confident use even during long performances.