1.ELRS Is An Open Source Project; Regardless Of ,Frequency Matching Possible,But The Following Three Conditions Must Be MetThe Frequency Must Be The Same,The Receiver And Tuner Must Be The Same 915Mhz The Tuner And Receiver Firmware Versions It Must Be Consistent,For Example,The Receiver Must Be Firmware 3.0;The Tuner Must Also Be Firmware 3.0.Neither Of Them Has A Binding Password Or They Both Set The Same Password(The Receivers Are Shipped From The Factory Without A Binding Password). 2. The Receiver Is Quickly Powered On And Off Three Times; After The Third Power-On, The Receiver Led Flashes Twice Quickly At An Interval Of 1.5 Seconds, And Then Press Key On The Remote Control Or The Key On The Tuner To Bind The Frequency. After The Frequency Is Successfully Coupled, The Receiver Light Is Always On. 3. The Tx And Rx Ports On The Flight Controller Connected To The Receiver Are Abnormally Inverted And The Led Is Always On; Just Replace The Tx And Rx Ports. For Example: After Connecting To The Tx1 And Rx1 Terminals Of The Flight Controller For The First Time, You Can Change To Tx2 And Rx2; Then Open The Uart2 Port. 4. If The Receiver Does Not Receive A Signal From The Remote Control For About After Being Powered On, It Will Automatically Enter The Wifi Flash Mode; That Is, The Firmware Upgrade Mode. 5. Leave It Alone After Powering On; It Will Automatically Enter Wifi Flashing Mode In About ; The Led Light Will Flash Quickly. Description: Receiver Is Based On The Open Source Architecture And Program Of Expresslrs. The Receiver Uses Low Latency And High Refresh Rate Rf Chip With A High Refresh Rate Of 25hz-500hz, Which Is Very Suitable For FPV Competition And Remote Fpv. At The Same Time, These Receivers Are Ultra-Light And Ultra-Small In Size, Making Installation Easier And The Aircraft Simpler. Indicator Status: Double Flash: Code Matching Mode Flashing Slowly: No ansmission Signal Received Steady On: Transmission Signal Received Depending on the batch, the appearance, color, and printing of the product , which does not affect use. Material: plastic colour: As shown Package Contents: 1 * Receiver 1 String Of Wire 2 * Transparent Cover 1 * Motherboard 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.