it is a wall mounted impedance matching stereo volume control, which connects between the speaker level output of an amplifier, receiver or speaker selector and a pair of speakers.

Model VC-05 VC-30 VC-60 VC-120
Rated Power 5W 30W 60W 120W
Line input 100V 100V 100V 100V
Attenuation Per Tep 6dB 6dB 6dB 6dB
Total Attenuation 18dB 18dB 18dB 18dB
Dimensions(L"w H)mm 115*70*54mm/80mm 115*70*70mm/80mm 115*70*70mm/80mm 115*70*70mm/80mm
Material ABS ABS ABS ABS
Weight 100g/150g 200g / 250g 350g / 400g 450g / 500g
Installtion Wall Surface Wall Surface Wall Surface Wall Surface
Color White White White White