Live end feed powers the track system from the end of a run. Junction box canopy mounts over a 4" or 3" octagon outlet box and includes two knockouts. Current limiter can be used as on/off switch. Compatible Track System: Two-Circuit Polarity: Right Polarity Input Voltage: 120V Breaker: 2.5A Maximum Wattage: 300W per circuit Dimming: Triac or ELV Finish: White