3S 20A 18650 Lithium Battery Protection Board (BMS)
3W 9V solar panel with an aluminum frame
3×18650 battery holder without a cover
4 CHANNEL BLUETOOTH RELAY SHIELD
4 CHANNEL RELAY 5V SHIELD
4 Channel RF Remote Control Module
4 CHANNEL WIFI RELAY SHIELD
4-20mA 0-10V Signal Generator Adjustable Voltage and Current Simulator
4-20mA 0-10V Signal Generator Adjustable Voltage & Current Simulator
Compact and precise signal generator for testing and calibration. Offers adjustable 0–10V voltage and 4–20mA current output with a clear digital display. Ideal for PLC testing, sensor simulation, and industrial automation calibration. Ensures stable, accurate, and reliable performance in labs or field use.
4-channel 12V relay module with optocoupler isolation
4-channel 5V optocoupler relay module
4-channel remote control transmitter and receiver circuit board
