The ew 300-2 IEM G3 Wireless Stereo Audio Monitoring System (A: 516-558MHz) from Sennheiser is a wireless stereo audio system that provides terrific versatility in a compact package. Ideal for rental and PA companies, musicians, houses of worship, and anyone else who needs clear stage monitoring, the system consists of an SR 300 G3 transmitter and a pair of EK 300 IEM G3 receivers.The transmitter and receivers have 1680 tunable UHF frequencies for interference-free operation. They also have a pilot tone squelch feature for eliminating interference when the transmitter is turned off.The units can be wirelessly synced for quick setup. The transmitter offers simple menu operation with an illuminated graphic display for more control options. An Ethernet port allows you to connect to a network in order to control the transmitter with the Wireless Systems Manager software from a computer.An auto-lock on each unit prevents accidental settings changes, while an HDX compander provides high-quality audio. An integrated 5-band graphic EQ lets you shape sound to favor audio frequencies that you prefer. A mute function silences the audio.Each receiver operates on a pair of standard AA batteries, and also has external contacts points for charging a BA 2015 rechargeable accupack battery inside the receiver. A pair of IE 4 earphones is included for each receiver so you can begin monitoring immediately.Transmitter