Eliminates humming and buzzing due to ground loop issues Filters out DC current in the signal path Passive in-line device Connectors:2x Male,2x Female;Gold plated Name: Audio Noise Filter color:blue Material:plastic case Size:about 90x50x23mm Rated input:50W input:100W Package Contents: 1x Car Audio Noise Filter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.