Onboard interface, suitable for series motherboards Support LoRaWAN protocol, applicable to a wide range of frequency bands Active temperature-compensated crystal oscillator is used to long-term stable operation in high and low temperature harsh environments Support , GFSK, LoRa modulation, excellent anti-blocking and ultra-long-distance communication characteristics Onboard PH1.25 battery holder and charging IC, which can be connected to lithium battery for charging and discharging High receive sensitivity down to -148 dBm and programmable transmit power up to 22dBm Supports preamble detection, with , up to 256 bytes packet engine RF chip:SX1262 Transmission power:22dBm Transmit current:107mA@22dBm Receive current:5.3mA@125KHz Signal modulation:LoRa/(G) Operating voltage:3.3V Communication interface:SPI Working temperature:-40 - 85℃ Rechargeable lithium battery:3.7V 600mAh Working frequency band:915M(902-930MHz) Colour:Blue Material:PCB Package Contents: 1 * Expansion Board 1 * Lithium Battery 1 * Antenna 1 * IPEX1 Generation To SMA Conversion Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.