NEXUS AMPLFIRE ST2500BC Amplifier 500w 1 MIC input on front panel, 2 MIC/LINE inputs and 2 AUX inputs on rear panel 1 Pre-amp output, 1 group of Aux Send and Aux Return CHIME and SIREN button MIC1 input, Chime and Siren sound with priority function MIC2 and MIC3 input with delay effect, inside effector with 3 knobs Main volume adjuster, treble and bass adjusters 5-segment level indicator, signal, peak and fault indication Mp3 player with Bluetooth and FM radio Protection: over current, over heating, short-circuit, limiter, turn on delay and DC offset 6 zoning output with volume adjusters Output: 100V, 70V, 4~16 ohm Power supply: AC230V, DC24V(backup power)