Amazon.com: Xvive U4 Wireless in-Ear Monitor System …

Make sure this fits by entering your model number. 【Great 2.4GHz Band】2.4GHz wireless in-ear monitor system create your personal or team’s monitor system. uncompressed wireless signal transmission, low noise and latency.Mono balanced XLR or mono unbalanced TS input.Provides smooth frequency response with any headphones.

https://www.amazon.com/Xvive-Wireless-Monitoring-Transmitter-Beltpack/dp/B07ZHB5V2Z