This Shure PSM 300 in-ear wireless monitor system is perfect for musicians and performers who desire a high-quality audio experience on stage. With adjustable gain, built-in antenna, and stereo features, this system provides clear and consistent sound for a seamless performance. The transmitter and receiver have a G 20 range of 488-512 MHz, making it ideal for use in large venues. This system is designed to offer the best in wireless connectivity, without compromising on quality. Unit was used one time.  Set of KZ-ZST ear buds included.