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Dry and cold winter is common season for rough and blistering hands.
It’s hard to look after parents bare hands and maybe something like cellphone with case on which they carry with them all time could be a warmer in steady in body temperature for convenient usage.
A good thought came to combine handwarmer and cellular phone which people carry around all time in winter.
It's shaped in comfortable form in hand and named it 'pebble.'
Case itself is USB chargeable. Lower middle locates on/off switch.
It generates heat about 35°C and the heat is produced in back for phone protection purposes.
Chungju, South Korea
Busan, South Korea
sul hwa Choi
Seoul, South Korea
han byul Choi
Jeongeup-si, South Korea