Compared with other factory products our updated version of the star-shaped electronics welding kit which adopts a two-sided wiring design and a variety of flashing LED mode with 40 frosted LEDs softer lighting giving a hazy beauty. The acrylic case design which is very clear and reflects color good.so your cool kit can be placed in your favorite position. In addition it is the best decoration for you and your friend in the festival. Manufacturered by IS. Basic parameter:acrylic Shell Size: 8.5cm x 9cm x 2.1cm; Work Voltage: DC3.5 5.5V 100mA; Basic Function: LED flashing & Beep music. We have uploaded the user manual on Amazon page at technicial specfication. and we have video to help you know how to install it. Icstation Star Electronic Welding Kit is an entry-level Soldering kit that takes you into the world of enjoying soldering may you fall in love with DIY Soldering!