SC SERIES SC1 Type: Combination Model 15 Built-in Sounds (Max. 108dB at 1m), 5 User-Defined Voice (Max 98dB at 1m) Voltage: DC:12V,24V AC:110V,220V Dimension (mm): Width: 150 Height: 287 Depth: 200 Materials: Lens-AS Housing-ABS Protection rating: IP44 SC2 Type: Combination Model 15 Built-in Sounds (Max. 115dB at 1m), 5 User-Defined Voice (Max 108dB at 1m) Voltage: DC:12V,24V AC:110V,220V Dimension (mm): Width: 174 Height: 312 Depth: 232 Materials: Lens-AS Housing-ABS Protection rating: IP44 SC3 Type: Combination Model 15 Built-in Sounds (Max. 120dB at 1m), 5 User-Defined Voice (Max 115dB at 1m) Voltage: DC:12V,24V AC:110V,220V Dimension (mm): Width: 244 Height: 381 Depth: 292 Materials: Lens-PC Housing-Al Protection rating: IP56