Handa HD PV Panel On-Board Conenctor +NTC is the newest upgrade version of Handa HD HDC4 panel mount PV Solar connectors,updated the size from M12 to M20, nut rear locking to easier front locking and making the copper pins' crimping type to advanced pins panel soldering on-board,the pins is all-in-one style without any breakpoint(Reduce the risk of burning caused by poor contact). what's more, it within NTC function integrated, make sure faster temperature monitoring to better protect your solar system.