Post cap lights are a great way to spruce up your deck and landscape. This set of two post caps are solar powered wireless lights that work best for 4x4 standard posts. These contemporary=style black and white solar post caps provide soft lighting to outdoor decks without the hassle of hooking up wiring or using electricity. The solar powered post cap lights include an on-off line switch, and when the post cap solar light is switched to "on", it will automatically turn on at dusk after charging during the day. Made of strong plastic material, the post cap light will continue shining even in poor weather conditions on a full charge.