- Sennheiser EW-D CI1 Y1-3 - Digital wireless system with Instrument cable CI1, Dynamic range: 134 dB, Audio transmission range: 20 Hz - 20 kHz, Frequency range: Y1-3: 1785,2 - 1799,8 MHz, Transmit power: 12 mW, 4-digit battery indicator on receiver, Mobile access via Smart Assist App for system settings, Operating time with AA batteries: up to 8 hours, 2 BNC antenna jacks, Outputs: XLR, jack (balanced/unbalanced), incl. 2x antennas, power supply with country adapters, rackmount set, AA batteries