Brunton Core Fuel Container for Reactor (4-Pack) Brunton Product Includes Fuel canister Great for camping 4 Units in Pack Intended for use with the Brunton Hydrogen Reactor Battery Charger Designed for powering smart phones, UV water purifiers and many on-the-go devices Hydrogen Power Fuel Cell Technology for Power Off the Grid and On the Go Planet Safe Power - Solid State with no Natural Discharge, no Toxic Chemicals and Recharged from Water