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: PCBWorking Voltage: 1.8-3.7vAcceptable Current: 10-14mAEmission Current: 120mA + 20dBm90 mA + 17dBm29 mA + 13dBmWorking Frequency: 915MTransmit Power: + 20dBmReceive 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&1.2KbpsFrequency Error: 15KHzFIFO Space: 64ByteData Rate: 1.2K-300Kbps FSK0.018K-37.5Kbps LoRaModulation Mode: FSK, GFSK, MSK, GMSK, LoRa TM, OOKInterface Form: For SPISleep Current: 0.2uA SLEEP1.5uA IDLEWorking Temperature: -40-+85Default Baud Rate: 96001A Battery ManagementLED IndicatorUSBCP2104-GMRPre-flash firmwareFor SoftRF V4.0Battery: 1x18650(not include)Package List:1 x Development Board1 x Antenna2 x Pin.