Electric Heated Vest, Heated Vest with 30000mAh Battery, DC/USB Power Supply, 3-Level Temperature Adjustment, Women's and Men's, Fast Heating, Washable Using the DC port: Can be used by direct connection. Using the USB port: Requires a short press of the battery's power button. Switching from DC to USB: First, long-press the battery's power button to turn the battery OFF, then short-press the battery's power button again. 【2024 New Model 17-Zone Heated Vest】This product is the 2024 new model heated vest from the ROSAICEE brand's heated series. It incorporates 17 heaters in the neck, back, abdomen, chest, and waist, and each area's heater can be controlled separately with four power buttons, allowing you to stay warm even at -15 degrees Celsius. 【3-Level Temperature Adjustment, Independent Adjustment for Each Area】The four power buttons on the left chest can each be controlled separately, making it easy to use according to the temperature and situation. Easily switch between three temperature levels: Low (USB: approx. 35 degrees Celsius, DC: approx. 45 degrees Celsius), Medium (USB: approx. 45 degrees Celsius, DC: approx. 55 degrees Celsius), and High (USB: approx. 55 degrees Celsius, DC: approx. 65 degrees Celsius). 【7.4VDC Connector & Japanese-Made Heater】Unlike conventional products, the ROSAICEE development department has adopted a 7.4V DC connector based on the USB connector specifications. For those who are not satisfied with the temperature of the 5V USB connector in extremely cold conditions, please use the 7.4V DC connector. The DC connector raises the temperature instantly, reaching up to approximately 65 degrees Celsius. Furthermore, it is equipped with a Japanese-made fiber heater, which has better thermal efficiency than traditional heating wires and can achieve rapid preheating in 3 seconds! The lifespan is also 2-3 times longer than commercially available heated vests. 【Includes a 30000mAh Large-Capacity Battery】A PSE-certified 30000mAh large-capacity battery is included, so you can use it immediately upon arrival. The estimated usage time varies depending on the temperature. It takes about 10-12 hours for the battery to fully charge. *The estimated usage time may be shorter depending on the number of uses and the usage environment. 【Material Composition & Design & Size Description】The heated vest is filled with fluffy, soft padding, and Japanese-made fiber heaters are sewn into the padding, making it your best ally this winter.