Refrigerated cold boxes are used for transportation sensitive items such as medicines, vaccines etc. when transported inside a van, car etc. These are small refrigerators which work on 12 V DC or 24 V DC, depending upon the model. The cold box can be connected to the DC power supply inside the car and it will work as a refrigerator. Also it comes with an adaptor which converts 230VAC or 110VAC to 12 / 24 VDC. So if you want to connect the box while inside your office or warehouse, you can use this adaptor to connect to a 230 V / 110 Volt power source depending on your country.