Electrical Voltage Outdoor modules, 115VAC transformer with internal junction box Indoor modules, 115VAC three prong plug-in transformer Station output: 24VAC Transformer output: 24VAC 1.25A Operating Temperature 0-150℉ Dimension Indoor dimension (L x W x H): 9.5” x 3.75” x 8.25” Outdoor dimension (L x W x H): 10” x 4.5” x 9”