Sennheiser SK 100 G4 Wireless Bodypack Transmitter (AS: 520 – 558 MHz)

Robust bodypack transmitter for daily use on stage.
Easy and flexible wireless synchronization between transmitter and receiver via infrared
Fast frequency allocation for up to 12 receivers via new linking functionality
Up to 20 compatible channels
Up to 42 MHz bandwidth with 1680 selectable frequencies, fully tunable in a stable UHF range
Transmission Range: up to 100 meters / 300 feet
High RF output power (up to 30 mW) depending on country regulations