This unit contains rechargeable batteries. Switch the ON/OFF switch to ON. The unit is ready to be used now. Place the solar panel in a way that it will collect as much daylights as possible (not right under a tree, in the shade). When it starts to get dark, a light/dark sensor will switch the unit on automatically. The LED's will stay alight until the batteries are empty. The the next day, batteries will be recharged again by the daylight. Please note that a sunny, bright day will make the LED's light up longer and brighter and a dark, cloudy day will make the light shorter and dimmer.