【Easy Installation】Each package contains 3 bases (4x4 wooden post and 4x4/5x5 vinyl post) and screws. Choose the appropriate base size and place it on the corresponding post, then screw the two screws into the post through the small holes on both sides of the base. The solar fence post cap light is charged in sunlight for 6-8 hours during the day and automatically turns on for 10-12 hours at night【Mode selection】Our 4x4 solar deck post cap lights have two modes: flashing lights like flames and a fixed warm light mode. It can illuminating fences, decks, mailboxes, making them a versatile and stylish addition to any outdoor space【IP64 waterproof】4x4 vinyl fence post solar lights have been upgraded with IP64 waterproof material, which it can withstand high temperature heat, pouring rain, snowstorm or any other outdoor environments. These 4x4 post cap of vinyl fence post cap lights protect your post from rain and sun to prevent premature rotting【Product size】The most important point: solar post cap light is a small-sized light - please check the size of your posts first. If you are unsure of any doubts about the size, you can first confirm with our after-sales team. We are very happy to answer your questions! The height of the 4x4 solar post cap light is 2inch/5cm. the length of 4x4 solar fence post cap light is 4.3in/11cm, the width of 4x4 solar deck post cap light is 4.3in/11cm【100% Satisfaction Service】We proudly stand behind all of our products 100% and offer a full 2-year service for our outdoor post lighting. This will cover you if the lights stop working or there are any defects within those 2 years