System Application: Universal; Stages Heat/Cool: 4/2; Power Method: Hardwired; Terminal Designations: RC, RH, C W/E, W2, Y, Y2/*, O/B, G, ACC+, ACC-; Color: Black; Volts: 24; System Switching: Heat-Off-Cool-Aux; Dimensions L x W x H: 5.6"X 3.25"X .77"; Connected: Yes;