doace heated vest for women and men, smart electric heating vest rechargeable, warming heated jacket, lightweight heated coat for skiing fishing camping hunting motorcycle, battery not included doace for a combination of functional comfort and quilted design, reach for the sleeveless quilted heated vest from doace, this unisex heated vest helps you stay cozy and warm. <br><br> <b>operation: </b> <br> <b>※ please use a portable battery pack (not included) with 2a or 2.4a usb output to power up this heated vest. ※<br></b> <b>step 1. </b> unzip the inner pocket and take out the usb cable. <br> <b>step 2. </b> insert the usb cable into the usb output on the battery. then push the power button on your battery pack to turn it on. the thermal switch on the vest (near your right abdomen) now cycles through blue, red and green light for once, indicating the heated vest is plugged in. <br> <b>step 3. </b> long press the button to turn on/ off the heating areas<br> <b>※the red light stands for high heat. the blue light indicates medium heat and the green light signals low heat. ※</b><br><br> <b>specifications: </b> <br> three heating levels: <br> 149°f/ 65°c (high, red light) <br> 131°f/ 55°c (medium, blue light) <br> 113°f/ 45°c (low, green light)