Argo Add-On Zoning Modules For Arm Relay Control, 4 Zones AD-4Switching ACtion: 0.085 / Thermostat Current: SPST / Single Phase Motor Rating 120V AC: 1/3 HP Product Specifications BRANDArgo LENGTH INCHES9-1/2 WIDTH INCHES8 HEIGHT INCHES3 WEIGHT LBS3.75 COLORBlack ZONE QUANTITY4 PHASE1 HORSEPOWER1/3 SWITCH TYPESPST LIMITED WARRANTY YEARS1 MANUFACTURER'S PART NUMBERAD-4