Dual channel level converter. The CLEANBoxPro provides two channels of unbalanced to balanced level conversion and two channels of balanced to unbalanced level conversion in a rugged, compact, and portable unit. Balanced lines offer increased immunity to external electrical noise, such as hum. Since a balanced system minimizes induced noise, it is the preferred method of connecting audio gear, especially when long lengths of cable are used. Each section has stereo level controls to optimize signal levels. An LED indicator lights when power is applied. Frequency response: 20 Hz - 20 kHz. Comes with external power supply. Dimensions: 47 x 117 x 109 mm. Weight: 0,5 kg.