Features 1、The jumper hat of the voltage control adapter module can realize the high potential or pull down output of the output port. 2、The onboard 4 channels 817 are independent, which can realize different voltage control at the same time. 3、This product has effective photoelectric isolation and strong anti interference ability. 4、It can drive high voltage driving applications such as high power transistors and MOS tubes, and also directly drive low power 24V relays. 5、If the voltage control adapter module is a pulse signal, please note that the limit of 817 is 4KHZ or less. 6、If the control signal is greater than 4KHZ, please do not use this module, otherwise it will not work normally. Specification Item Type: Voltage Control Adapter Module Material: Copper Clad Laminate Center Distance of Mounting Hole: Approx.42x32mm/1.7x1.3in Package List 1 x Voltage Control Adapter Module