AUTOMATIC DIGITAL HUMIDIFIER CONTROL FOR USE WITH APRILAIRE EVAPORATIVE HUMIDIFIERS; VOLT: 24, MODEL SERIES: #60 REPLACES MODELS #56 AND #58, BLOWER ACTIVATION CAN BE MANUAL OR AUTOMATIC, HUMIDITITY RANGE: 1-7 OFF/LESS/NORMAL/MORE, FEATURES: LIGHTED DISPLAY PROVIDES READINGS FOR INDOOR RELATIVE HUMIDITY READOUT, INDICATOR LIGHTS UP FOR WATER PANEL CHANGE, SERVICE CALL, AND HUMIDIFIER ON, 3/4" HOLE IS REQUIRED FOR DUCT MOUNTING; INCLUDES: OUTDOOR SENSOR, DIMENSIONS: 4-1/4"H x 6"W x 1-3/4"D, WEIGHT: 6 OZ, IN MFG BOX, MADE IN USA