https://www.tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platform/ https://www.tindie.com/products/kdcircuits/trigboard-ultra-l... That o

https://www.tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platform/ https://www.tindie.com/products/kdcircuits/trigboard-ultra-l... That one has extra circuitry to shut the esp down completely and wake it on either an external trigger or RTC based alarm. It claims 1.5uA sleep current. The creator has a YouTube channel with lots of info about low power and other interesting tidbits https://www.youtube.com/user/kdarrah1234 https://www.youtube.com/user/kdarrah1234