Heated vest heating system that consists of 13 carbon fiber heating pads that generate consistent heat for 5 core body parts, including your neck, back, abdomen, and waist, helping to maintain body warmth Press and hold the smart button on the electric heated jacket for 3 seconds to freely switch between 3 temperatures: Red(50-55/131); White(40-45/113); Blue(30-40/101). Have the most comfortable experience even in outdoor activities with different temperatures Polyster Machine Wash Fastening: Zipper Sleeveless Electric heated vest is compatible with any power bank with 5V /2.1A USB output port. A 10000mAH fully charged power supply can keep heating for up to 10 hours and minimum 6 hours It can be automatically cleaned and dried using a washing machine, or left to dry naturally. Avoid wringing out like any other garment, proper cleaning ways will prolong the life of the vest This vest is a great gift for friends and family, with a USB port and power bank connection, one button to control the temperature, it is easy to use even for the elderly. Carbon fiber heat source can relieve stomach and muscle pain. Chargers don't include