Technical Parameter Signal Voltage DC48Vï¼?Telephone line power supplyï¼? Standby Work Current â?¤0.2A Frequency Response 250ï½?3000 Hz Amplified Output Power 10ï½?25W Defend Grade IP68 Corrosion Grade WF1 Ambient Temperature -40ï½?+60 Atmospheric Pressure 80ï½?110KPa Relative Humidity â?¤95% Lead Hole 3-PG11 Weight 5.5kg Installation Wall-mount