Description: 100% Brand New and High Quality! Size: As Shown. Materials: Zinc alloy, stainless steel. Working voltage: 3.4V-3.7V-4.0V. Battery capacity: 350MAH. Battery Properties: Rechargeable Battery. Rechargeable Battery: Lithium Battery-Polymer. Package Included: 1 x Solder Iron Battery Pen. Features: Advanced materials, lightweight and compact, fine workmanship, simple structure, and USB connection. Note: Please check the size carefully before you buy the item and a slight color difference should be acceptable due to the light and screen.