Volume Controller. With a PC-1e(B)/(W) you can remotely control the volume of both left and right speakers which makes it a great addition for music and video playback on a PC.Compact for desktop use. Passive type. No need for battery. Robust metal chasis and machined aluminum knob. Included are a Stereo mini cable (80 cm) and 2 x RCA Pin Cable (100 cm). Input: 3.5 mm stereo phone, Output: RCA Pin x 2 (L,R), Dimensions: 52(W) x 37(H) x 60(D) mm, approx 120 g. Color: Black