Most mini fridges run off UK mains power. They have coolant inside that must be allowed to settle for 24 hours when installing or relocating the fridge. Some travel models use different cooling technology. Other motorhome/camping oriented models may provide the option of 12-volt DC power, UK 230-volt mains power or an insertable gas canister for true off-road living. As long as you follow the instructions, these are safe products to use indoors and depending on the model’s suitability, sometimes outdoors in the shade too.