Remote Controller Parameters: Built-in ELRS: ELRS 2.4GHZ Built-in ELRS refresh rate: 250HZ Remote control sensor type: potentiometer sensor Antenna: built-in ipex1 generation copper tube antenna Working voltage: 6-8.4V DC Remote control distance: more than 500m Output interface: high-frequency NANO warehouse (crsf protocol) TYPE-C (only charging and firmware flashing) 3.5MM Simulation trainer port Battery: 18650 flat battery x2 (not included, need to be purchased and installed by yourself) Charging: TYPE-C charging current 1.2A charging time about 3-4 hours Remote control channel: 8 channels Bluetooth: Bluetooth 4.2 ELRS firmware upgrade : WIFI or TYPE-C line brush ELRS firmware version: ELRS 3.0 ELRS firmware name: DIY devices 2.4 GHz DIY ESP32 + E28 2.4GHZ TX Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Colour:Transparent White Material:plastic Package Contents: 1 x For C1 Remote Controller Kit 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.