myFC PowerTrekk Fuel Cell Charger Unique hybrid device combines a fuel cell with a rechargeable lithium ion battery for charging USB-compatible devices such as mobile phones Compact and lightweight design ideal for travel, outdoor adventures off-grid, or in cases of emergency at home when power is lost Detachable lithium ion battery can be used independently of fuel cell as a travel charger Safe, non-toxic chemical process uses water and inert materials to produce electricity Silent operation charges phones at virtually same rate as 110v electrical outlet