HI, esphome is wifi and (see earlier comment) I was/am not confident that a simple battery would hold up long enough. Adding costly lithium stuff for outside open to all is too much of a risk so I aim to turn zigbee with low battery use. The c2530 one can program to have the pins measure the pulse sensor (not explaining details but happy to share just ask). When connected via Z2M it shows me the pulses with which I can do whatever I like…The target is to have low energy use with a simple AAA battery powered c2530…qed