Features: GPS module NEO-6M, global positioning system, 3V-5V power supply universal. Designated module with ceramic antenna, super-strong signal, support for automatic frequency correction and automatic gain control. With the latest REV1 version ESP32, 4MB flash memory, support for wireless Internet access and Bluetooth connectivity. This product is made of high quality PCB material, strong and durable. With digital RSSI function, support for wireless Internet access, low voltage detection and temperature sensor, fast wake-up and frequency hopping, with data backup battery and LED signal indicator. Highly configurable packet handler that saves configuration parameter data for EEPROM Down. Specification: Material: PCB Working Voltage: 1.8-3.7v Acceptable Current: 10-14mA Emission Current: 120mA + 20dBm 90 mA + 17dBm 29 mA + 13dBm Working Frequency: 915M Transmit Power: + 20dBm Receive Sensitivity: -139dBm LoRa and 62.5Khz&SF = 12 and 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 Form: For SPI Sleep Current: 0.2uA SLEEP 1.5uA IDLE Working Temperature: -40℃-+85℃ Default Baud Rate: 9600 1A Battery Management LED Indicator USB CP2104-GMR Pre-flash firmware For SoftRF V4.0 Battery: 1x18650(not include) Package List: 1 x Development Board 1 x Antenna 2 x Pin .