warmble pebble shape electric handwarmer by seong cheon from korea

Warmble is an electric portable handwarmer that is motivated by a pebble.
Unlike previous button type handwarmers, Warmble is designed to be operated by turning the upper section on a pivot. Because it remains comfortable uses and an esthetic form.
Also, this clear form like a pebble has USB port inside.
This clear form of Warmble is not only an esthetic element, but also for preventing malfunction.