The USB relay module features a stable USB to serial port chip and microcontroller. Serial port debugging software can be used on a computer to send commands for controlling the opening and closing of two-way relays. Equipped with an 8-bit high-performance microcontroller and onboard CH340 USB control chip. Includes power LED indicator and relay status LED indicator. Supports relay switch status query. Features two 5V, 10A/250VAC, 10A/30VDC relays capable of up to 100,000 continuous switching cycles. Provides overcurrent protection and relay diode freewheeling protection. Color: Blue. Material: PCB and electronic components. Minor variations in printing may occur due to different production batches; these do not affect functionality. Color differences may appear due to lighting or display settings. Package Contents: 1 x USB Relay Module. Note: The package includes only the items listed above. Light reflection and screen settings may cause slight color differences between the image and the actual item. Measurement error allowance is +/- 1-3 cm.