Custom designed ESP Based PCB Board for Battery-Powered IoT Applications with ESP8266 Chip, LDO, Battery Charging & Lithium-Battery, integration with Home Assistant, and other Home Automation systems
This device is basically a development board based on ESP8266 chip and battery. You have 6 free I/O pins, you have free I2C pins, and you can attach as many sensors, relays, LEDs and other components as you want, and program it as you wish. This device has an integrated OLED display and a place for any I2C sensor. The main difference between this board and others you can find on AliExpress is in 2 things:
1.) LDO voltage regulator - Smart Voltage Regulator which use most of a battery
2.)LipoFuelGauge- Battery Monitoring System

For more detail visit:

needforelectronic.com