Expander module with 8 inputs in plastic box ATS1644 (included) with tamper. Up to 16 relay outputs through output boards. Powered by the same bus. Dimensions plate: 90 x 80 mm. Power 10.5 - 13.8 VDC (from the ATS BUS). Dimensions: 124 x 87 x 34 mm. Security Grade 3 Certified.