Chip Model: SMA Module: Semtech LLCC68 Chip; Development Board:STM32F103C8T6 Chip Module Size: SMA Module:20x14x2.3mm; Development Board:70x30x20mm Communication Protocol:LoRa protocol Transmission Power:0 - +22dBm Modulation Methods:LoRa and GFSK Working Voltage:SMA Module: 1.8V-3.7V; Development Board: 5V Sensitivity:-124dBm RF Inputimpedance:50ohm Transmission Distance:Open transmission distance of 8km FIFO:256Byte Hardware Interface:SPI Working Temperature:-40 - +85°C Crystal Oscillator Frequency:32MHz Industrial grade product quality: Equipped with professional RF shielding to effectively block external EMI and electrostatic interference. DX-LR20-433 Frequency Range: 430-470MHz (CF 433MHz) DX-LR20-900 Frequency Range: 850-930MHz (CF 915MHz) Specifications:A:LR20 900M22S/B:LR20 433M22S Color:As Shown Material:PCB Package Contents: 1 * LoRa Module 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.