Sennheiser 509148 XS Wireless In Ear Monitoring System (C:662-686 MHz)The XS Wireless IEM set includes everything you need for an easy start with personal monitoring. Defining new standards for simple, flexible, and reliable wireless in ear monitoring, this system is designed to help you level up your sound, regardless of your tech experience. Whether a rehearsal or live performance, on a club stage or for a worship service: Benefit from renowned Sennheiser sound and solid pro grade wireless UHF reliability packed in a