ZANE 2-Wire Low Voltage AC Dimmer, 10A, 12V (AC2-10AL-12V) Installs on the low voltage side of a magnetic step-down transformer for easy design&#44; fast installation Two-wire hookup&#58; No grounding wire&#44; bypass wire&#44; component matching ever Wide-band brightness performance from warm glow through high intensity. Halogen compatible Rotary adjustment with tactile on&#47;off. Soft start&#47;end extend bulb lifeApplications Yard&#58; Optimize illumination for pool&#44; patio&#44; spa&#44; pathway&#44; pond&#44; fountain&#44;