1、STANDARD HIFI OUTPUT: HiFi amplifier supports pure sound volume adjustment, standard HiFi output, full lossless and no sound coloring. ‑96‑0db balance potentiometer mode. 2、FULLY DISTORTION FREE: 0db for 4 into the switch mode volume to 0, the original state of the input signal, all without distortion, switch the 4 channel input signal. 3、0‑315DB PREAMP MODE: More than 0db automatically start the amplifier circuit. Maximum 31.5db can get to 10 times amplification, can be directly connected to the post amplifier to do pre stage use. 4、STC HIGH SPEED MASTER CONTROL CPU: 4 in 1 out switch amplifier adopts STC high speed main control CPU, input channels and volume data are saved instantly, and the memory function is restarted. 5、INDEPENDENT ST REGULATOR: Multi channel input stereo amplifier uses an on board 3 way independent ST regulator for independent isolation to eliminate interference and crosstalk noise. Item Type: 4 In 1 Out Switch Amplifier Material: Aluminum Alloy Remote Control Battery Specifications: 2 x AAA Batteries (Not Included) Control Mode: Multifunction Knob, Remote Control Number Of Channels: Stereo 2.0 Signal Size: Approx. 128 x 190 x 60mm / 5.04 x 7.48 x 2.36in 1 x 4 in 1 Out Switch Amplifier 1 x Instruction Manual 1 x Adaptor 1 x Remote Control 1 x Power Cord