Ultrasone Saphire professional In-Ear-Headphones, made of superior metal die casting quality, 2-way hybrid technology: high performance BA-Driver + electrostatic dual tweeter, frequency response: 10 - 50000 Hz, 25 Ohms...

Sennheiser SR 2050 IEM-GW, 2-channel UHF Stereo-IEM-Transmitter, 75 MHz bandwidth, 26 banks with up to 32 channels, HDX Combandersystem, switchable HF output 10/30/50/100 mW, Ethernet-conector, 558 - 626 MHz, 19" 1U'