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1000 units available with a short lead time.

Express post shipping available (product has a short lead time)
Here’s a clearer and more polished rewrite of your description:
A versatile relay board with opto-isolated inputs
This relay board offers reliable switching capabilities, with each channel rated for up to 10A at 28VDC.
Features
  • Although labeled for a 5V supply and logic, the board also operates reliably at 3.3V.
  • Includes a jumper to disconnect the VCC line from the transistor drivers, allowing you to test (“dry-run”) the module without energizing the relays.
  • Built with opto-isolators and transistor drivers for each relay coil, enabling control with only 2mA per microcontroller pin.
Specifications
  • Dimensions: 73 × 54 × 19 mm
  • Opto-isolator/LED Current Draw: 2mA per relay
  • Relay Coil Current Draw: 60mA per relay

The 4 channel 5V relay module with light coupling 5V appears in the following collections:

SKU LB-LR0051