The 22 mm alarms include a NEMA gasket which enables the alarm to meet NEMA 3R, 4X, and 12, IP-66, and CSA 22.2 No. 94 waterproof applications. Mallory’s cUL yellow card lists the NEMA 3R, 4X, and 12 approvals. All 22 mm alarms are also RoHS Compliant and cUL recognized and marked as such.