This link's heated socks can be controlled using a mobile app. After connecting the phone to the socks via Bluetooth, you can automatically control the temperature and switch the socks on and off on your phone, which is quite convenient. Foreign trade bestseller, domestic sales highly recommended, mobile app available in Chinese and English versions The Bluetooth chip of this product is built into the switch and can be used alone or connected to a battery box (for export hot-selling models), or connected to a lithium battery Foreign trade clients can provide English manuals