A nice touch is the smooth spring action inside this unbranded relay, which feels reliable without being too stiff.
DC 3.7V – 12V 5V Mini Size Relay Remote Control Switch, 433Mhz Wireless RF Momen
The LK-61644 feels familiar in the hand, and its clear name helps you stay organized "You will find that the LK-61644 sits nicely among other relays, with its model name easy to spot.