Connected to a 5V Arduino Uno 2 receptors It Works. Only the XY-MK-5V have worn a maximum of 3 meters around without antennas while the other I install in the same confguration and therefore without antenna has a range of recepetion (with the same equipment in issuance) more large 10zaine a meter ie the XL-R03A module.
The receiver XY-MK-5V absolutely must be completed with an antenna (1 thread of about 17 cm) for better reception.
so apart from this little weakness, I am satisfied. for the issuance Module I did not test not being my priority when I would, I reposterais a complement.
Sincerely.
