3 Heat Settings To Keep You Warm At Any Temperature: These heated socks come with 3 temperature settings that you can choose depending on the weather. Adjust your electric thermal socks to either low temperature mode (35⁰C/95⁰F), medium temperature mode (45⁰C/113⁰F), or high temperature mode (55⁰C/131⁰F). You can rely on these heated boot socks to keep your toes comfortable no matter how cold it is. Long Lasting Upgraded Battery: The battery heated socks can last for up to 9 hours so you don't have to worry about the power running out too soon. With consistent charging, you can even enjoy using your electric heated socks for a few days without any problems. Feel free to go on long walks or travel while these electric warm socks keep your feet comfy all the time. With a charging time of just 3 hours, your USB rechargeable socks can warm you up right away.