Features: 1.MAIN PURPOSE: 1 channel optocoupler isolation module, mainly used to detect the existence of 220V AC, which is efficient and practical. 2.OUT AND GND: The input terminal is connected to the signal output OUT, the GND on the board is connected to the power negative pole. 3.LEVEL OUTPUT: The output TTL level can be detected by a single chip computer, 3?5V power supply, can also be connected to PLC24V level. 4.EASY CONNECTION: The green 2P 5.0 terminal is connected with 220V voltage, and the 3P terminal is connected with single chip computer input. 5.5PCS IN 1 SET: Including 5pcs optocoupler isolation modules, small and compact, easy to install and replace, has a wide application range. specification:Item Type: Optocoupler Module Material: PCB Function: Can be used to detect whether 220V AC exists PackageList:5 x Optocoupler Module Note1. After the module is powered on, do not touch any device in the white wire frame on the board 2. Please pay attention to power safety because of high voltage