Our factory can provide all certification documents and certificates needed for export, please feel free to consult customer service! Electric heating socks support customization, please contact customer service for customization Electric heating socks are available in full foot and forefoot heating options, please contact customer service for notes No problem heating at minus 40 degrees, constant temperature at 55 degrees, warm without being hot! Hot-selling items on major foreign trade websites! Win-win cooperation! This can accommodate lithium batteries or you can install 1.5V dry batteries yourself; it's dual-purpose and versatile Comes with battery box (can use AA batteries for power supply) or lithium battery! Please consult customer service for details These socks can be equipped with lithium batteries or power bank styles; you can customize them according to your needs by contacting customer service! The product has received CE certification and can be exported for foreign trade. It can be sold on all major foreign trade platforms. If you need original images, please contact customer service!