The GroStik from Priority Products utilizes the sun's energy and the latest in graphite technology to safely electrify the soil surrounding your plants, rapidly increasing the growth rate and yield by as much as 50%. It also naturally deters up to 99% of insects. Use the GroStik in direct or indirect light, and it can be reused time and time again. Simply wipe the rods after each growth period and you're good to go!