Below-deck control module box 3 5/8″ x 4 3/16″ x 2″ deep with water resistant faucet sensor cable connection, mixed water elbow fitting and integral strainer, 1/2″ NPSM female 360 swivel coupling nut and AC or DC operated with (4) AA batteries. Certified to ASME A112.18.1/CSA B125.1, NSF 61-Section 9, NSF 372 and UL 1951.