Passive type. No need for battery. Robust metal chasis and machined aluminum knob * Included are a Stereo mini cable (80cm) and 2 x RCA Pin Cable (100cm) * Input: 3.5mm stereo phone, Output: RCA Pin x 2 (L,R), Dimensions: 52(W) x 37(H) x 60(D)mm, approx 120g