These are four power units for security cameras with 12-volt batteries. In case of a power outage, the cameras will continue to operate. However, be cautious, as the box is exposed to the sun; it should be placed in a cool location. As for the small device, this device opens the parking gate for car entrances. It operates on a USB system. When you place the USB drive inside the car 🚗, when you approach the parking, the gates will open for you 👍. The price for this part is 100 riyals. The four satellite power units are 400 riyals with batteries 👍.