Features: Diversity reception: This product adopts diversity reception technology, which can simultaneously receive from different and select source through intelligent, ensuring stable signal connection and avoiding signal interferences. Long distances reception: With excellent long-distances reception capability, users can maintain good connection even in long-distances flight or control situations. Good reception: Equipped with advanced receiving chip, it can effectively receive signal by Quadcopter or other control devices, providing clear and stable data transmission. Supports multiple frequency, providing users with more usage option and the ability to adapt to different environment. Long distances flight: suitable for scenario that require long flight over a large area, such as Aerials photography, search and rescues, to ensure stable signal connection and avoid signal loss or interferences. Specifications: Material:PCB Frequency Types:915MHZ/ 868MHZ ESP32 D4 Two-Tier SX1276 Voltage:DC5V Note: Due to the problemsof lighting effects and shootingangles, there mightbe tolerances in the product, please understand. Please allow 0-2mm error due to manual measurment. Package includes: 1PC ES900 Two-Tier RX ELRS Diversity Receiver