Bulk sale of 12 pieces, great deal! An EMS and heater device for the neck and shoulders. Even more savings with a set of 24 pieces available. Please comment if interested. Quoted from the official website: This is a neck and shoulder-specific Chill Out EMS machine (relaxation machine) that has been improved to be painless while maintaining the effects of professional low-frequency therapy. It warms tired necks and shoulders with a heating element and loosens them with low-frequency EMS. - Model Name: CORITO LOOP TIE - Brand Name: VONMIE - Model Number: VON033 - Functions: EMS & Heater - Usage: For neck and shoulders - Frequency Range: 0-200Hz - Brand: VONMIE - Product Name: CORITO LOOP TIE - Model Number: VON033 Thank you for viewing.