Welcome to our shop! Description: This USB Relay Module is equipped with high-performance microcontroller chips and a CH340 USB control chip. It also has LED power and relay status indicators. The module is built with a military-grade double-sided circuit board, ensuring durability and reliability. It is 100% brand new and of high quality. Specification: - Product model: E-3 - Communication chip: CH340 - Communication protocol: Serial port communication - Communication format: (9600, 8, NONE, 1) - Baud rate: 9600, 8 bits, no parity, 1 stop bit - Weight: Approximately 17g Features: - Use serial port assistant to send 0xAA, the relay remains open. - Use serial port assistant to send 0xBB, the relay remains closed. - Use serial port assistant to send 0xCC, the relay works for 1 second then stops (Jog). Package list: - 1 * USB Relay Module 100% Satisfaction: Our customers are 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.