TNHA is a professional manufacturer that has focused on Crane Push button switch,,Industrial wireless remote control , Elevator control station and limit switch for 17 years. TNHA have professional effective team and Technical team , Strong independent R & D capability serve client's by heart .We also have all kinds of customized products with professional and exquisite.We also have ISO9000 Management system certification and CCC,CE,TUV ,UL.