Welcome to our shop! This product is a 4 channels optocoupler isolation module with a limit conversion frequency of 20KHZ. It is widely used for signal isolation and level conversion between single chip microcomputers, PLC, and other signals. Made with high-quality materials, this module is strong, durable, and has a long service life. It features great workmanship and can be a perfect replacement for the old one. With its small size, it is easy to carry and store, making it convenient to use. It also delivers excellent performance. Item Type: 4 Channel Optocoupler Isolation Module Model: 213 Conversion Frequency: 80KHZ Type: Power Module Please note that 100% satisfaction is our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactory after-sales service.