1. Ultra-Long Communication Distance 15km, Constant Power Output When Voltage Changes From +20dbm-100mw 2. High Sensitivity: -148DBM, Half-Duplex Spi Communication 3. Programmable Bit Rate Up To 300kbps, Supports , Gfsk, Msk, Gmsk, Lora And Ook Modulation Methods, 127db Rssi Dynamic Range 4. Automatic Signal Detection, Cad Mode And High-Speed Afc, Packet Engine With , Up To 256 Bytes, Small Size Dual-Column Stamp Hole Patch Package 5. With Shielded Shell, Spring Antenna (Ra-01) Or External Antenna (Ra-02) Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which 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.