Magnolia heated socks are powered by 2pcs 3.7V 2200mAh lithium polymer batteries, with the Mobile Warming Technology, work and play in heated warm socks outside in cold weather is available nowadays. Your feet will stay in warm all day in extreme cold climate anywhere with our Heating Socks. Say goodbye to cold feet! Heated Gear Features: Brand: Magnolia Material: Cotton Polyester Spandex Heat Zones: Instep of the foot Gender: Unisex Size: universal size for most of people Cleaning Method: hand wash only and hang it to dry 3 Levels Temperature Setting: Red Light:100% Heat, 3-3.5 Hours Orange Light:75% Heat, 4.5-5 Hours Green Light:50% Heat, 6-6.5 Hour Package Includes: 2 x heated sock 2 x rechargeable battery 1x AC charger 1 x user manual ❤Warm Note: *The 3.7V batteries need to be fully charged before using. You need charge the 2 batteries about 12 hours to activate for the first time, then 5 hours each time. *To save more battery life and keep safety, you can set the socks at temperature setting High Mode(Red Light)at first 5-15 minutes(time varies due to different needs), then you can adjust it to setting Medium Mode(Orange Light)or Setting Low Mode(Green Light) and you will feel cozy. *If you think it’s warm enough, you can turn off the setting(press the ON/OFF button until you see the lights out), please do remember to turn off the heat settings when you go to sleep.