Smarkey push the limits of science and product design. We believe no one should have to suffer from the bitter cold, whether it’s your grandma who can’t seem to stay warm, or the airline worker on the tarmac in the heart of winter. No matter the person, everyone deserves the opportunity to be comfortable and warm. Smarkey Heated Jacket means having control over your core body temperature. We don’t like heating sensations, we like real change you can feel and see with a thermometer— that’s our difference. We don’t want our customers to feel warm, we want them to be warm. Smarkey Men Heated Jacket Heated Jacket Heating system Smarkey heating element uses 8.4V power, all internal voltage does not exceed 8.4V, safe voltage for human is within 36V All current carrying components are insulated, no current will pass human body Improve the winter daily lives through excellence in product innovation More Smart More Warmer To turn on, press and hold the heated jacket power switch for about 3 seconds. The Cordless Heated Jacket will begin to preheat (5 minutes) and then adjust to the medium setting.Temperature setting can be adjusted at any time by pressing the Cordless Heated Jacket power button. Eachpress will cycle through the heated jacket’s temperature settings. Pre-Heat - Red LED fades on and off High - Red LED continuous Medium - White LED continuous Low - Blue LED continuous Read more Q&A: 1. How long time will heated jacket battery last while working? Answer: At ambient temperature of 25℃/77℉ testing, heated jacket battery will last approximately 8-9 hours on low, 6-7 hours on medium, or 3-4 hours on high. 2.What's the temperature when heated jacket in use? Answer: At ambient temperature of 25℃/77℉ testing, the heating area will up to 45℃/131℉ on high setting, 42℃/113℉ on medium setting and 38℃/100℉ on low setting. 3.How long time will samrkey heated battery take to fully charge? Answer: From empty, the battery will take roughly 8 hours to fully charge. Smarkey heated jacket already include battery and charger in package. 4400mAh battery can support up to 8 hours heating. Body temperature can be clearly seen through thermal imaging after heating. Upper body heating position is on the front and back side, this is according to body ergonomics. The heat flow will move through the jacket from body to limbs. How to operate Heated Jacket? 1. Unzip the battery holder pocket 2. Place the connected battery into the holder pocket and zip closed. 3. To remove the battery, unzip the battery holder pocket, remove the battery, and disconnect the power cable. Read more Women's Heated Jacket Men's Heated Jacket Women's Heated Vest Men's Heated Vest Heated Jacket Battery Battery and Charger Included ✓ ✓ ✓ ✓ ✓ Battery Capacity 7.4v 5200mAh 7.4v 5200mAh 7.4v 5200mAh 7.4v 5200mAh 7.4v 5200mAh We don’t make people feel warm, We make people be warm. Read more