fernida electric heated vest body warmer unisex heating vest jacket sport outdoor clothes-small (battery included) fernida <b><br> heating technology: <b><br>thin micro-carbon fiber heating panels actively <br>function for carbon fiber: improve circulation of blood for health care; no deformable, washable, waterproof <b><br> how to use (3-way switch refers to button switch on the vest) <br>1. plug the power cord in your garment`s pocket into the 7.4v rechargeable lipo battery. <br>2. turn on the rechargeable battery by pressing the power button (note: the 3-way switch on the vest will flash red, white, blue in turn at the same time). <br>3.press the 3-way switch on the vest for about 3 seconds, red led will be on, now the heating system on the vest starts to work. sometimes, when press the 3-way switch, red led will be not on, while flashing, please don`t worry, this means the heating system is in self-inspecting. we can just do the following step: press the 3-way switch in turn (red-white-blue-red), then it will work again. <br>4. press the 3-way button switch to adjust the temperature: red for high (70-75°c), white for medium (60-65°c), blue for low (40-45°c). <b><br> features: <br>free size slim and light design, warming up very soon, good for pain relief, perfect for outdoor activities, such as snowmobile, motorcycle, mountain, camping, hiking, skiing, fishing, hunting or office routine and business outdoor. <br>far infrared heating materials promote blood microcirculation, good for relief pain of muscles. <br>excellent lightweight design,easy to collect with small space. <br>optimum placement with one on the back provide quick warm-up and even distribution of heat where needed most. <b><br>note: <br>1. the heated vest usb plug is in the inner pocket, plug it with power bank usb port <br>2. only 2.0a or above 2.0a output current can be use for the products.