Using these LED tealight candles is easy. Just turn the on/off switch at the bottom to light them up. They are powered by a CR2032 lithium battery which is included. When the battery runs out, you can easily replace it with a new one. Remember, these candles are not waterproof, so keep them away from water to avoid damage. To make them last longer, turn them off when not in use. Enjoy the warm and cozy glow of these flameless candles in your home.