What's in the box:

USB Serial Port Control Relay Module USB Relay PCB Board (Standard)

The module is equipped with stable USB chip and microcontroller, which can use serial port to debug software and send serial port instructions to control the opening and closing of relay.

Features:
Controller Chip: onboard with the high performance microcontroller chip.
Control Chip: onboard with CH340E USB control chip.
LED Indicator: onboard with relay status LED indicator light.
Relay: onboard 5V, 10A/250VAC, 10A,/30VSC relay, with long service life that can withstand up to 100,000 pick-up time.
Protective Function: with over-current protection and relay diode follow current protection to ensure safety operation.

Specifications:
Material: PCB
Communication Chip: CH340E
Communication Format: (9600,8,NONE.1) baud rate: 9600, 8 bit, NONE, 1 stop bit
Communication Protocol: Sent 0AA, relay keep open
Hexadecimal: Sent 0BB, relay keep close, sent 0CC, relay work for 1 second and stop
Item Size: 71 * 16.7mm / 2.79 * 0.66in
Item Weight: 17g / 0.61oz
Package Weight: 18g / 0.64oz
Package Size: 11 * 7.5 * 2cm / 4.33 * 2.95 * 0.79in

Packing List:
1 * Module