1. USB serial port control relay, serial port control, long life, overcurrent protection 2. USB serial port control relay, newly upgraded and advanced version, with new optocoupler protection circuit to prevent interference and high-speed transmission 3. The output terminal of the relay can be regarded as an electronic switch, controlling the on and off of the circuit. There is actually no voltage output at the load end of the module. 4. When there is no voltage in the relay coil, the relay does not pull in, and the common terminal (COM) is connected to the normally closed terminal (NC). When there is voltage, the relay pulls in, and the common terminal (COM) is connected to the normally open terminal (NO). 5. USB serial port control relay<br><br>Relay path: 5V Power supply method: Type-c interface/pin header Control interface: Type-c interface/pin header Microcontroller chip: GD32F103C8T6 Baud rate: 115200bps LED indicator light: power indicator light and relay status indicator light Circuit design: With overcurrent protection and optocoupler protection functions Output type: relay common terminal, normally open terminal, normally closed terminal Load type: Load powered at 10A/30VDC, 10A/250VAC Product size: About 58x32mm Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:As Shown Material:PCB Type: DSTUR-T40 4 Channel<br><br>Package Contents: 1x Serial Port Control Relay (Type C) 1x Type-C Cable (50cm) 1x 10Pin 2.54mm Female To Female Dupont Cable (20cm)<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.