Firebeetle Battery Powered Latching Relay

Hi, I've discovered the Firebeetle, and would like to try creating a battery powered deep sleep latching relay. I have a strip of fairy lights running off of a battery pack currently four AA Batteries I think two for 3v, and the other two for capacity. I'm sure the leds could handle a higher voltage, so it may be beneficial for the Firebeetle to run off of the same battery pack. anyways, I ordered a esp 32 from Ada Fruit, and a feather latching relay. Is the feather latching relay compatible with the Firebeetle? I mean do the pins match? Do you guys make your own latching relay board for the Firebeetle? Can any one help me with this project? I'm very new to IOT. So I guess in order to order a couple of firebeetles, I need to know if you have a latching relay, and what else I may need. Ideas, thoughts? Thanks for the help..