SonoCare Warm Bag is an electric hot (heating) gel bag filled with gel,  that quickly heats up in 8 to 10 mins and bag is made up of a thermally insulating material that can retain the heat and sustains the temperature for 2 to 4 hours. It comes with automatic temperature control which can prevent overheating of the bag, if left unattended.
Sonocare warm bag is very handy for eliminating muscle fatigue and improves blood circulation.