The KNX IO 410 (4I) is a compact binary input with 4 channels for controlling lights, blinds, etc. The inputs can be controlled via conventional switches with an external voltage of 12 to 230 V. It can also be used as a pulse counter. Two buttons and three LEDs enable local operation and visualization of the device status. In addition to the input channels, the device contains 16 independent logic or timing functions. Sales unit: 1 ST.