Description:  1.Three levels of intelligent temperature settings give you full control over how much warmth you get;  2.Five carbon fiber heating elements generate heat across core body areas - left & right flank, left & right waist, mid-back;  3.A fully charged 8000-10400MAh power bank enables the waistcoat to work up to 6-8 hours.(power bank is not included);  4.Zipper front design,easy on and off;  5.With velvet lining,keep warm better.     Specification:  Black/Sliver Heating Vest;  Size: S/M/L/XL/2XL;  Closure Type: Zipper Fly;  Material: Polyester,Neoprene;  Lining Ingredients: Cotton;  Heating material: carbon fiber;  Physiotherapy parts: shoulder, back, abdomen;  Thermal technology: far infrared temperature technology;  Warm:45 degree Celsius (Red Light);  Comfort:35 degree Celsius (White Light);  Energy Saving:25 degree Celsius (Blue Light);  Input voltage: 5V.     Note:  1. Please remove the power bank before washing.  2. Make sure put heated vest into laundry bag before putting into washing machine, otherwise washing machine will break the wire line.  3. Wash it gently by hand, do Not twist it.  4. USB Interface charging (Power bank is NOT included).     Package included:  1 X Waistcoat (Not Include Power Bank).