Microphone volume and chime separately adjustable.
Chime frequency range: 440-659 Hz.
Unidirectional dynamic pattern.
Unbalanced  jack 1/4" audio output.
Adjustable volume level.
ON - OFF switch.
Supply: DC 12V with external supplier (included).
Impedance: 1000 ohm.
Frequency response: 80 - 12 kHz.
Sensitivity: -63 dB.
Dimensions: 393 x 205 x 150 mm.
Weight: 1.3 kg.