This phono preamplifier comes with two anti-resonance and non-magnetic housings, built in a beautiful brushed aluminium block. One of the housings accommodates the RIAA correction and the other the power supply with filter and regulation. The rear panel features two beautifully-crafted pairs of gold-plated RCA (input and output), a terminal that accepts an earthing wire or a banana plug for your vinyl turntable, ground, if it has one. On the underside, the Basic + Phono features two push buttons for the selection of the cartridge type (MM or MC). Note: these adjustments are completely separate for both channels as the phono preamplifier has a dual mono architecture. To pack as much technology as possible into this tiny box, the manufacturer has used surface mount technology (SMT) and very high quality integrated circuits according to SMD technology. Their assembly with very short leads reduces noise and retains the dynamics and signal fidelity. The impedance is automatically detected and compensated. Don't try to find an on/off switch...the Basic + does not have one. This is not for saving purposes, but because it will stay on continuously and that the circuits stay powered for best musicality. This highly versatile preamplifier boasts a superb highly symmetrical build, quite exclusive. Obviously, Clearaudio designed it to be perfectly compatible with its own MM and MC cartridges, though it is also compatible with all other commercially-available cartridges. The music is full of enthusiasm and punch with a wide and precise sound stage. The battery-powered Accu Plus power supply, which is very rare! Gives you the best result, It wards off background noise and distortion, delivering amazing transparency and precision. This great preamplifier will be a perfect match for the best turntables and cartridges on the market!