This plastic square solar post lamp is a great conversation piece for your outdoor gatherings. When fully charged, the solar post lamp will provide you with ambient lighting at any time of the evening and illuminate for 8~10 hours. Place the light within your garden, yard, or favorite flower bed. There is a switch on the battery box (located on the inside of the light, under the solar panel).To turn on the light, please switch to the "ON" position. Make sure your post could be perforated and then plug the provided mounting screws into the post to keep the lamp stably. Note: The light is designed to work in the dark. Make sure that the solar light is not being affected by any other light source. The performance of the solar light will vary with the time of year. It will deliver more light when it has had a full day in the sun rather than a day in overcast weather.