Specifications for FCM-1: - Normal operating voltage: 15 to 32 VDC - Maximum SLC current draw: 6.5 mA (LED on) - Temperature Range: 32F to 120F (0C to 49C) - Dimensions: 4.675 H x 4.275 W x 1.4 D (Mounts to a 4 square by 21/8 deep box.) - Average operating current: 350 A direct poll, 375 A group poll with LED flashing, 485 A Max. (LED flashing, NAC shorted.) - Maximum NAC Line Loss: 4 VDC - Humidity range: 10% to 93% non-condensing - UL/FM