Pro-Ject's Accu Box S2 Battery Power Supply is a clean and accurate 'Accu' power supply designed especially for phono products. Providing superlative audiophile-quality power transmission, the Accu Box S2 has an incredible synergy with all Pro-Ject Phono Boxes and turntables. Using Accu Box S2 on any recommended Pro-Ject products results in a more homogeneous and spacious sound with better separation and imaging. The sound will come across as more 'cleaned-up' overall, giving you a relaxed listening experience with mind numbing sonics. Using battery power instead of a connection to household AC power lines delivers a quiet, noise-free power signal to your electronics. Note: Turntable hook-up requires optional Pro-Ject Connect-It 18V/15V 2.5-2.1mm cable, not included, sold separately.