1, 1CH line in, 1CH line out 2, High level aluminum panel, with advanced polish processing 3, With short circuit/ overload protection automatic detecting function 4, 450W/650W has 4CH manual zone function 5, Power output: 100V/70V/4-16Ω 6, Standard Spec: 450W, 650W, 850W, 1000W, 1500W