Grow care pot with a plug-in USB (Universal Serial Bus) cable. Detects moisture & fertility via built-in sensors in real-time. Coloured light for low battery (Red), needs water (Blue), needs fertiliser (Yellow). Green indicates all is good. 3 flashes indicate too much fertiliser. made from polycarbonate with IPX6 waterproof rating for indoor use. Lithium rechargeable battery. The battery cannot be replaced.