Brand new and high Overheat overcurrent short circuit full protection.The use of stable and With LED displaySuitable for electronic production DIY enthusiasts6.Welding convenient and simple installation7.Regardless of the and negative input, compatible with 27V AC or 40V DC or less8.Circuit board size:58*42mmColor: greenmaterial: metalNOTE: In order to maintain good regulation characteristics, please LM317 chip input and output pressure of about 3V; when using a current, it is recommended to increase the area of heat sink or cooling fan.Package Included:1 set LM317 Adjustable Voltage Regulator Step-down module DIY KitNote: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.