Bosch PLE-1ME240-EU 240W Plena Mixer Amplifier, 4 microphones and background music (BGM) input, Announcement only output, 3‑wire volume override, PTT (push to talk), 2‑tone chime, Built-In Standard Headphone Output, Loudspeaker output 4 ohm: 31V (240 W), Frequency response (Line) : 60 Hz to 20 kHz (+1/‑3 dB @ ‑10 dB), Frequency response (Mic.) : 70 Hz to 20 kHz (+1/‑3 dB @‑10 dB).