Well this is truly romantic the Sanyo Eneloop Kairo is a portable heater the ones which you can keep in the pocket during chilly winters and to commemorate Valentine’s day it is available in special pink packaging with a heart. It looks more like the Mighty mouse and its base is made of metal, once you turn on the switch the metal gets heated up which keeps you warm. It has a built in Lithium Ion battery which charges in 6 hours and provides around 5 hours of warming on a full charge. I believe it is one of those gifts which will be always close to your loved ones heart. The unit measures 62×84×19mm and weighs 65 grams.
A Japan only product for now as Eneloop batteries are available in the West, the Kairo sells for 4000 Yen ($ 33).