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2‑Pack LCUS‑1 USB Relay Module, CH340 Serial Port Control Intelligent Switch with Over‑Current Protection for PC Control and Smart‑Home Projects Product Description Model Type: LCUS‑1.Operating Voltage: DC 5V (USB powered).Control Chip ：On‑board CH340 USB‑to‑Serial Control Chip.
This module is equipped with a reliable USB‑to‑serial chip and microcontroller. You can turn relays ON or OFF by sending serial‑port commands via PC serial debugging software.
It comes with on‑board power‑supply LED indicators and relay‑status LED lights, alongside over‑current protection and freewheeling‑diode protection for relays.
Built‑in USB‑to‑serial control circuitry enables direct connection to a computer without additional adapters.Notice:The relay provides passive‑output only and merely functions as a switch; it does not output any voltage.
Compact size of 62*16*12 mm and weighing only 15g, this lightweight relay module is easy to install for smart‑home and PC automation projects.
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