In-ear monitoring double-set (A Band 516-558MHz), featuring the ear-canal phones with various ear-fitting pads, adaptive diversity receiver that uses the headphone cable as a secondary antenna for flawless reception and high quality. Pass-through outputs allow easy splitting of the input signal to travel to other devices. Lastly, the entire set can be monitored and remotely controlled with Sennheiser's "Wireless Systems Manager" software due to the built-in Ethernet port on the stereo transmitter. The double-set features enhanced frequency bank system with up to 16 compatible frequencies, 42 MHz bandwidth: 1680 tunable UHF frequencies for interference-free reception, automatic frequency scan feature searches for available frequencies, Auto-Lock function that avoids accidental changing of settings, HiBoost, adjustable limiter, stereo/focus mode, balance in receiver and more. The set include 1 SR 300 G3 stereo transmitter, 2 EK 300 G3 stereo diversity receivers, 2 IE 4 earphones, rack mounting set, power supply unit, batteries and antenna.