Battery Lithium Ion Polymer 3.7v 1200mAh 2.1mm plug Need a simple wireless connection

Need a simple wireless connection when Wi-Fi and Bluetooth aren’t available

What does the Photoelectric Counter IR LM393 measure

1/8/7 as a display only Official Waveshare resources

This module is the integration of 2 sensors

Battery Lithium Ion Polymer 3.7v 1200mAh 2.1mm plug Need a simple wireless connection3. 7V Lithium Ion Polymer Battery 1200mAh The Lithium Ion Polymer Battery 3. 7V 1200mAh is a rechargeable lithium cell with a JST connector, designed for portable electronics, wearables, IoT devices, and maker projects. Pair it with a LiPo charger like the TP4056 or Adafruit Micro Lipo. Safety: Lithium batteries can be dangerous if punctured, short circuited, or overcharged. Always use a proper LiPo charger with protection circuitry. 3. 7V battery