To Isolate and eliminate noise caused by a ground loop | 4 channels, composed of two pairs of stereo (L+R) inputs and outputs | Each of the RCA plugs and jacks is gold-platedDurable , smooth , corrosion-free connection | To ensure that the shield ground on each audio cable is isolated from any equipment ground | Dear buyer, due to lighting effect, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you!

- This cute mini desk vacuum cleaner is perfect for cleaning crumbs, dust, eraser dirt, lint or ashes from table or countertop. | - Powered by two AA batteries(not included). No wire needed, low sound, portable, cute and efficient. | - It saves clean up time on the kitchen counter top or table and will sweep while gathering all waste together | - Just empty waste when its full, and then you can restart it. Its suitable for home, office, and cars. | - Great to remove the dust on the surface of home appliance, computer keyboard or furniture.