"ENVIRONMENT CONTROL SYSTEM COOLS/HEATS EQUIPMENT STORED IN COMMUNICATION CABINETS. MAINTAINS TEMPERATURES BETWEEN 0 TO 125 DEG F. THE SYSTEM PROVIDES UP TO 550 WATTS OF COOLING CAPACITY AND 300 WATTS HEATING CAPACITY. SYSTEM ALARMS CAN BE SILENCED OR BLACKED OUT WITH TOGGLE SWITCH. VOLTAGE:28 +/- VDC, WEIGHT:20 LBS.SYSTEM DIMENSIONS: L:7IN X W:18.5IN X H:9IN"