This unit doesn't come with a power supply.

Using this BSS BLU - BIB 8 - Channel Input Expander Break - In Box is easy. First, connect your devices to the 8 input channels. But remember, this box doesn't have a power supply, so you'll need to use your own suitable power source. When handling it, avoid dropping or hitting it to prevent internal damage. For maintenance, keep it in a dry and clean place. Regularly check the connections to ensure they are secure. If you notice any issues, don't try to repair it yourself; contact a professional.