The Sabine SWM4000 series wireless microphone systems deliver reliable professional sound quality, simplified setup, and competitive pricing. Automatic frequency selection and infra-red transmitter links make finding clear channels quick and easy for both novice and experienced users. Lockout features assure that settings will not be accidentally changed. The SWM4000 is available in a number of frequency bands that accommodate most government requirements worldwide. They are shipped in the US and the rest of the Americas in the 902-928 MHz band where they are guaranteed to be free of DTV and smart phone interference.
Packaged with Sabine’s rugged transmitter designs, the SWM4000 Series delivers clear wireless audio.

SW40-RH Single Channel Receiver Features:

• Automatic frequency selection
• Infrared transmitter sync
• Detachable ½ wave antennas
• 5 segment Audio display meter
• 5 segment RF display meter
• 25 MHz bandwidth
• ½ rack metal chassis design
• XLR and 1/4inch outputs
• Rack-mount hardware and carrying case included

SW40-H Hand-held Transmitters

• SW40-H13: HH Transmitter with Audix OM3 Dynamic Head
• SW40-H15: HH Transmitter with Audix OM5 Dynamic Head
• SW40-H19: HH Transmitter with Sabine H19 Condenser Head

All SW40-H Transmitters Feature:

• Metal housing with handling-noise suppression and soft touch, non slip finish.
• IR port - Receives infrared beam to synchronize frequencies
• Programable LCD screen
• Programable on-off / mute switch
• Mute indicator

More info can be found here