1. Ultra-Long Communication Distance 15km, Constant Rf Power Output When Voltage Changes From +20dbm-100mw2. High Sensitivity: -148DBM, Half-Duplex Spi Communication3. Programmable Bit Rate Up To 300kbps, Supports , Gfsk, Msk, Gmsk, Lora And Ook Modulation Methods, 127db Rssi Dynamic Range4. Automatic Rf Signal Detection, Cad Mode And High-Speed Afc, Packet Engine With , Up To 256 Bytes, Small Size Dual-Column Stamp Hole Patch Package5. 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 UseSpecifications: RA-02 Development Board (Soldering Pins)Product Type: With Base PlateCommunication Interface: UartPower Supply Voltage: 3.3VPower Supply Current: 0.2AColour:As ShownMaterial:PCB Package Contents:1x 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.