Expansion Module Dimensions W x H x D: 36 x 90 x 55 mm Inputs: 4 Digital Inputs, abbreviated: 4 DI Operating temperature: 0...+50 °C Outputs: 4 Transistor Outputs, abbreviated: 4 TO Certification: According to VDE 0631, IEC 1131, cUL(Us), FM, naval architecture approvals Operating voltage: 24 VDC Series: LOGO! Protection rating: IP20 No. of digital inputs: 4 No. of transistor outputs: 4