Features: Equipped with a 16MB black box, it can record, analyze, and replaying flight data. Insert and use design, convenient for quick installation and use. Equipped with 42688P gyro, providing a more stable flight controlling and control experience. Stack designing save space and simplifies cable routing. With highly performances and sensitive reaction speed, data recording function help users analyze flight performances and improve flight skill. Specifications: Material: Printed Circuit Board Type: F405 Flight Controller BLS50A ESC Kit, Flight Controller, 4in1 ESC(optional) F405 v2 Flight Controller: MCU: STM32F405 IMU: ICM42688P(SPI) Air Unit Connection: Direct plugging into Air Unit Black Box: 16M onboard USB Connector: USB C OSD: OSD with AT7456E chip BEC: 5V,9V double BEC Firmware Target: GEPRCF405 Size: 36.8x36.8mm, hole 30.5x30.5mm,φ4mm hole becomes φ3mm after use shock-absorbing circle UART: 6 BLS50A 4IN1 ESC: Galvanometer: Support Continuous Current: 50A Burst Current: 55A(5s) Support Protocol: Oneshot125/Oneshot42/Mulishot modes/Dshot 150/300/600 Size: 42.9x39.7mm, hole 30.5x30.5mm,φ4mm hole becomes φ3mm after use the shock-absorbing circle Target: G_H_30 Package Includes: 1x F405 Flight Controller BLS50A 4in1 ESC STACK Kit or 1x F405 Flight Controller or 1x 50A 4in1 ESC note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.