Description This module allows you to use low level signal to control a higher level voltage, for example, 3V or 5V voltage controlling 9V or 12V voltage. IT uses the TLP281 optoisolator and discrete transistors to correct the logic. Comes with four channels. Great for use in noisy circuits where signal lines require electrical isolation When IN1 is high level, corresponding OUT1 voltage equal to HVCC, when IN1 is low level, OUT1 voltage equal to HGND. Maximum HVCC 24V, Output maximum current equal to HVCC/5.1K, Maximum absorption current 500mA Dimensions: 2.6 cm x 2.5 cm x 1.6 cm Weight: 3 g Packing List 1 x TLP281, 4 channel opto-isolator Module