The HP-AMP-250BT is a 250 watt, 6 Source amplifier with a Bluetooth, MP3, USB, and SD Card options. With 5 Microphone input options OR you can choose one or three of the auxiliary inputs or one of the two line inputs. Input 1 has a priority override with mute-function. The 250 Watts can be in one large zone or in 6 separate 70 volt zones with there independent controls per zone. The amplifier has the ability to be 70 or 100 volt, or 8 ohms.