4-Channel Rca Audio Noise Filter Suppressor Ground Loop Isolator Car Stereo 50W Eliminates humming and buzzing due to ground loop issues Filters out DC current in the signal path Passive in-line device Connectors:2x RCA Male,2x RCA Female;Gold plated Name:RCA 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.