From Amazon
Adastra | Mixer Amplifier with 4-zone Paging
HW Audio
Adastra RM244V 100V Mixer-Amp With 4-Zone Paging (953.244UK), Grade B
Inta Audio
Adastra RM244V 4-Zone Paging 100V Mixer Amplifier with Bluetooth
CommsAndSound
Adastra Rm244v Mixer-amp With 4-zone Paging