Cold Heat Soldering Pen Heats Up To 700 Degrees F Built-In LED Project Light Built-in LED project light & automatic shut-off. Solder over 600 joints per battery pack. Perfect for electronics, jewelry, crafts, and hobbies. Comes in a durable, convenient carry case. Approx. 7.5" x 2" x 1". Uses 4 AA batteries, not included.