Features 1、Ultra-compact lightweight hum eliminator, has a tough, rugged metal housing. 2、This device breaks the ground loop safely, to remove 60Hz AC hum caused by ground loops. 3、It automatically converts signal(unbalanced to balanced) with no any signal loss, for clear sonic quality. Specification Features: Ultra-compact lightweight hum eliminator, has a tough, rugged metal housing. This device breaks the ground loop safely, to remove 60Hz AC hum caused by ground loops. It automatically converts signal(unbalanced to balanced) with no any signal loss, for clear sonic quality. Passive noise canceller can work without battery or external power, convenient to use. 1 XLR/6.35mm channel, 1 XLR/6.35mm channel, 1 RCA channel, 1 3.5mm channel are equipped. Note: It's mainly used for eliminating the current noise caused by ground loops, other noise can not be eliminated. Specifications: Material: ABS + Metal Color: Black Product Weight: 450g / 15.87oz Product Size: 11.5*10*3.7cm / 4.52*3.93*1.45in Package Weight: 570g / 20.10oz Package Size: 20*18*5.5cm / 7.87*7.08*2.16in Note: Simultaneous multi-channel input and output is not supported. Please connect device with the input and output port of the same channel. Noise canceller only, other accessories in the pictures are not included. Due to manual measurement, there may be deviation, please in kind prevail. Due to lighting or other reasons, the picture and material object may slightly differ. Packing List: 1 * Noise Canceller Package List 1 * Noise Canceller