A transformer (also driver or power supply) converts 230 volts into 12 or 24 volts for LED strips and other low-voltage lighting. Choose one with the same voltage as your strip and sufficient wattage.
Choose a transformer with about 20 percent more wattage than your strip requires. For a 5-meter strip with 14 watts per meter (70 watts), choose 100 watts. If you want to dim, check if and how the transformer is dimmable: with a standard dimmer or via 1-10V.
