Production-prototype ESP32-S3 control/RF/GNSS/sensor board for an outdoor livestock collar. Includes LoRa 915 MHz, GNSS, I2C/I2S sensors, local actuator drivers, battery-cell solder pads, solar pass-through, soldered flex-tail zones, HV electrode isolation, test points, and a 120 mm x 80 mm 4-layer FR4 target stackup.