4 Channel USB Relay Module DC 5V Input for Automation Robotics Projects

Driverless USB 4-Channel Relay Module for Computer-Controlled Automation

24V 8-Channel Control Module with Optocoupler Isolation for Lab and DIY Use

24V 8-Channel Relay Control Module for Electronic Controller Prototyping Tasks

USB 4-Channel Relay Module for Computer-Based Control of Electrical Devices

12V Photosensitive Relay Module for LED Lamp and Outdoor Light Automation

USB 4-Channel Relay Module with Retained Settings When USB Disconnected