The communal antenna in my apartment building broke down, and it was going to take several days to repair, so I urgently bought a display model from a home center. However, when I got home, it was already fixed, and I was frustrated, so I took it out of the box and connected it just to try it out. The picture quality was excellent. It's a digital signal amplifier with a built-in booster and a 2-way power supply, which can be powered by an AC adapter or a USB port. - Model Name: IDA-7CB - Type: Built-in booster type - Power Supply: 2-way power (AC adapter / USB port) Thank you for looking.