This is a vest that in side of it contains carbon ribbon witch when you put electricity through it will heat up. all of the carbon heating ribbon is connected to each other creating a full circuit. The vest holds in on of its pockets holds a 6 volt battery housed in a 3D printed shell that has all the circuitry needed to run the vest. the way you would operate the vest is a combination of button pushing to turn on the vest and to set different heating levels, in the circuit there is an way to recharge the battery to ensure the battery can be reused. when the battery is fully charged it will activate a little vibrating motor. the circuit board the vest is using is a mini arduino.