Sunnytech 1PC Solar Power Swimming Pool Automatic Color-change Floating Ball LED Sense Light Solar power Lights Come On Automatically at Dusk, Waterproof. No wiring or additional power supply, easy to install, On/Off Switch. Full charged, about 5-8hours of light at night. Top of the hole can be threaded, can string together multiple light. Lighting For Garden/Outdoor/Patios/House Yard/Pond/Reservoirs/Lakes/Parks. Don't strike the product, so as not to cause irreversible damage. The stake is so sharp that you must be careful when using it. And don't let children play with it.