Reference:
K494M
Wall announcement microphone (built-in or surface-mounted). It incorporates a key to speak and sensitivity adjustment. 24 V DC power supply. Maximum consumption 90 mA. Nominal level of audio outputs 4.4 Vpp (+6 dBu). Bandwidth 200 ~ 15,000 Hz. 2 channels for audio switching. Strip connector. Dimensions 144x82 mm.