1. Ultra-Long Communication Distance 15km, Constant Rf Power Output When Voltage Changes From +20dbm-100mw 2. High Sensitivity: -148DBM, Half-Duplex Spi Communication 3. Programmable Bit Rate Up To 300kbps, Supports FSK, Gfsk, Msk, Gmsk, Lora And Ook Modulation Methods, 127db Rssi Dynamic Range 4. Automatic Rf Signal Detection, Cad Mode And High-Speed Afc, Packet Engine With Crc, Up To 256 Bytes, Small Size Dual-Column Stamp Hole Patch Package 5. With Shielded Shell, Spring Antenna (Ra-01) Or Ipex External Antenna (Ra-02) Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Specifications: RA-02 Development Board (Soldering Pins) Product Type: With Base Plate Communication Interface: Uart Power Supply Voltage: 3.3V Power Supply Current: 0.2A Colour:As Shown Material:PCB Package Contents: 2x RA-02 Development Board Module (Soldering Pins) 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.