Sennheiser EW-D ME4 R4-9, Digital Wireless System, With ME 4 condenser lavalier microphone, Frequency range R4-9: 552 - 608 MHz, Polar pattern: Cardioid, Switching bandwidth: 56 MHz, Dynamic range: 134 dB, Frequency range: 20 - 20,000 Hz, Transmitter power: 10 mW, 4-Digit battery indicator on the receiver, Mobile access via Smart Assist App for system settings, Operating time with AA batteries: up to 8 hours, 2 BNC antenna connectors, Outputs: XLR, jack (balanced/unbalanced), Incl. 2x antennas, power supply with country adapter, rackmount set and AA batteries