This 8-channel input expander doesn't come with a power supply. It's great for expanding signal inputs.

To use this 8 - channel input expander, first connect your devices to the input channels. Remember, you need to provide your own power supply. When using, avoid placing it in a wet or dusty environment. For maintenance, keep it clean and check the connections regularly. If there are any issues, make sure to disconnect the devices and check the wiring.