Hanging neck heating and cooling instrument: semiconductor refrigeration 3rd gear + winter hot compress 3rd gear, fan
+ cooling/heating: 1st gear about 2.5 s, 2nd gear about 2 s, 3rd gear about 1.5 s; separate fan: 1st gear about 9 s s, 2nd gear about 5 s, 2nd gear about 3 s; separate cooling/heating: about 4 s, suitable for both winter and.
Portable Hanging Neck Design: Personal Hanging Neck Fan Cooling can be stored, folded and adjustable in size,