FeaturesProvides PWM regulation of cooling and heating output for TEC unitsAutomatically switches between cooling and heating4 cooling temperature set points range from 22.5 to 35 deg C (35 deg C factory setting)3 heating temperature set points range from -5 to 15 deg C (15 deg C factory setting)Heating function can be easily disabled if desiredOn-board LEDs indicate low temp, high temp alarm and overall system statusDry contact relay output provides for external alarm indication