Features 1、Onboard high-performance microcontroller chips. 2、Onboard CH340 USB control chip. 3、Onboard LED power indicator and relay status indicator. 4、Adopt military grade double-sided circuit board 5、100% brand new and high quality. Specification Features: Onboard high-performance microcontroller chips. Onboard CH340 USB control chip. Onboard LED power indicator and relay status indicator. Adopt military grade double-sided circuit board 100% brand new and 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: Approx. 17g Use serial port assistant to send 0xAA, the relay keeps opening; Send 0xBB, the relay keeps closing; Send 0xCC, the relay works for 1 second then stop (Jog) Package list: 1 * USB Relay Module Package List