VT18-8-H-120-M/30/40a/65b/118 VT18-8-H-120-M/30/40a/65b/118 Adjustable background suppression Array control panel with clearly visible LED display Flashing LED power indicator in case of short circuit Multiple device installation possible, without mutual interference (no cross-talk) Not sensitive to ambient light, even with energy-saving lamps on Protection class II