The Mobile Warming Bluetooth Premium BT heated socks are the next generation heated sock that delivers 3.7-volts of instant heat for hours through our exclusive Bluetooth MW Connect app. MW Connect allows you to wirelessly adjust temperature or check battery levels to ensure cold feet are a distant memory. The Premium BT battery-powered heated sock is the perfect blend of Premium BT materials, comfort, and industry-leading heating technology to ensure cold feet are a distant memory.