Portable and compact adjustable electric soldering iron with a built-in 350 mAh battery and three voltage settings to match different soldering tasks. Fast heat-up and energy-efficient design for quick readiness and reliable performance on a variety of soldering materials. Modern appearance with practical construction that is easy to handle and suitable for everyday use by electronics enthusiasts and professional technicians. Versatile enough for home repairs, school labs, and assembly and maintenance of electronic products, adaptable to different environments. Use scenarios - Repair small consumer electronics at home, such as keyboards, headphones, or circuit boards, where portability matters. - Use in classrooms or makerspaces for student electronics projects and soldering practice. - Perform field service or on-site maintenance of electronic equipment with limited workspace and power access.