Brightech Ambience Pro Replacement Solar Panel Refresh your Brightech LED solar-powered string lights with commercial outdoor solar panels. You can place it almost anywhere with the original stake and clip; then your solar string lights won't need an outlet, and even spaces far from a building can be well lit. Compatible with 24- and 48-foot 2W solar strands (search for product codes B07CXV7BXL or B07M78QD7P to confirm compatibility) Panels for our 1W solar strands are sold separately. The on/off switch is located at the back. The panel is rated at 1,000 charge lifespan, which means it can last approximately 2.5 years.