Product upgrade part: 1. Pin GPIO34 of the pin header is replaced with GPIO15 2. Charging IC (TP5400) is replaced with power management AXP192 3. GPS TX, RX pins are replaced 4. The power switch is removed and replaced with a key switch 5. The sleep current is reduced to a low level 6. GPS battery replacement Product function MCU32 New MCU32 version: REV1 Wireless Internet Bluetooth 4MB flash memory 3D antenna LORA Product description Operating voltage: 1.8~3.7v Acceptable current: 10~14mA Transmitting current: 120mA @ +20dBm 90mA @ +17dBm 29mA @ +13dBm Operating frequency: 433/470MHz (433HMz version)/868M/915M (868MHz version) Transmitting power: + 20dBm Receiver sensitivity: -139dBm @ LoRa and 62.5Khz & SF = 12 & 146bps -136dBm @ LoRa and 125Khz & SF = 12 & 293bps -118dBm @ LoRa & 125Khz & SF = 6 & 9380bps -123dBm@FSK&5Khz&1.2Kbps Frequency error: +/- 15KHz FIFO space: 64Byte Data rate: 1.2K~300Kbps @ FSK 0.018K~37.5Kbps@LoRa Modulation mode: FSK, GFSK, MSK, GMSK, LoRa TM, OOK Interface: SPI Sleep current: 0.2uA@SLEEP 1.5uA@IDLE Operating temperature: -40 - + 85 Digital RSSI function Automatic frequency correction Automatic gain control Low voltage detection and temperature sensor Fast wake-up and frequency hopping Highly configurable packet handler Global Positioning System GPS module NEO-6M, 3V-5V power supply universal Specified module with ceramic antenna, super strong signal Save configuration parameter data EEPROM Down With data backup battery With LED signal indicator Default baud rate: 9600 Power TP5400 1A battery management LED indicator CP2104-GMR Pre-flash firmware -SoftRF V4.0 TTGO T-Beam MCU32 LoRa 433/868/915Mhz WiFi GPS NEO-6M 18650 battery holder What is LoRa? LoRa is a low-power long-distance wireless communication technology. It was developed by a French company, Cycleo, and later acquired by an American company, Semtech. Semtech then developed a set of LoRa communication chip solutions based on this LoRa technology. LoRa will be popularized and covered by the LoRa Alliance. LORA features: long distance, low power consumption, multi-node, low cost, anti-interference characteristics, and low speed and small data transmission LoRa frequency band: 433/470/868/915MHz frequency band