If you wish you could keep your beloved warm during winter, why not do it the hi-tech way by purchasing the Sanyo Eneloop Kairo for this Valentine’s Day? The Kairo is actually a portable heater that is small and light enough (measures 62mm x 84mm x 19mm, weighs 65 grams) to fit into virtually any pocket. It features a clear piece of plastic on the front, while the base is made from metal. The integrated li-on battery requires up to half a dozen hours for a full charge, dispensing five hours of heat in return. The Eneloop Kairo retails for approximately $30 after conversion.