... IC for Inteligent temperature control ,keep hand warmer run between 40°C-55°C,safe and comfortableb.With ... teperarure control mode,run between 40°C-55°C,but the time will be changes when the outside temperature changed ... with tempature control,but also run the hand warmer in a fixed time(3 hours)The user can choose one ... /PDA/PSP/GPS/MP4/MP5 ect.9.With the special USB charge cable,charge hand warmer by ...