Designed to perfectly blend comfort, performance, and value, Fieldsheer's Smart Thawdaddy 2.0 Bluetooth (Men's Heated Vest/ Women's Heated Vest) is updated with our powerful Mobile Warming Technology. Our Powersheer 7.4-Volt Lithium-Ion battery is supported by a universal USB charging port and can provide heat for up to 10 hours on a single charge. 4 distinct heat settings put you in control, and with seamless Bluetooth connectivity on our proprietary MW Connect app, you can stay warm in even the harshest winter conditions. Easily toggle between heat settings to find the perfect level of comfort on even the coldest winter days. MW Connect app available for download on the App Store or Google Play Store. The compact design and 100% Polyester shell keep you protected from the elements while Sweatsheer technology wicks moisture away from the skin, keeping you dry. Versatility is the name of the game when it comes to cold conditions, and our team of designers and engineers strive to produce cold-weather gear that won't let you down when you need it most.