... ,USP51,61,TRA approved - no external power - supply oem reusable pvc hot pack 1.CE,FDA,MSDS,USP51,61,TRA approved2.no external ... ensure that heat generation is maximised.3. Place the reusable heat pack in the cover/belt or wrap in a soft towel ... cooled it needs to be recharged. Place the hot pack in boiling water with cloth below.Note, prevent the plastic ...