AUDIO-TECHNICA M3 Wireless Monitoring System

The system consists of a stationary transmitter,
a belt-worn receiver, and in-ear headphones.
Frequency range:
Range L: 575.000 to 608.000 MHz.
Range M: 614.000 to 647.000 MHz.
Transmitter power 10 / 50 mW.
Operating time up to 8 hours.
Operating range up to 100 m.
Power supply 2 x AA 1.5V batteries.