Use chips LLCC68 from SEMTECH. Compared with the SX1278/SX1276 solution, the transmission distance is longer,the speed is faster ,and the power consumption is lower. Cost-effective LoRa wireless UART module. Communication key. RSSI environmental monitoring. Power failure protection. Power multi-level adjustable. Working Frequency band:850.125-930.125MHZ (Support ISM band) Transmitting Power:22dBm Air rate: 2.4k-62.5kbps (user-configured) Reference distance: 5000m Transmitting current: 110mA (instantaneous power consumption) Receiving current: 16.8mA Operating voltage: 3.0-5.5V (Greater than 5.0V can guarantee output power) Operating temperature: -40°C-+85°C (industrial grade design) Communication interface: UART serial port (TTL level) Colour:Green&White Material:Plastic + Metal Package Contents: 1 x LoRa Wireless Module(without antenna) 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.