Horizon Hydrostik Refillable Solid-State Hydrogen Cartridge Safe refillable hydrogen storage with green power - made with non-toxic materials and is a 100% recyclable! Power up all kinds of portable devices, including phones, game/music players, GPS and lights Electrochemical reaction creates an electrical charge; the small amount of water that accumulates as a byproduct is released as vapor One Hydrostik offers approximately 10 times the power of a conventional AA alkaline battery Hydrostik cartridges work with the Horizon MiniPak fuel cell charger and can be recharged with the Hydrofill hydrogen charge station