The KK2.1.5 is next big evolution of the first generation KK flight control boards. The KK2.1.5 was engineered from the ground up to bring multi-rotor flight to everyone, not just the experts. The LCD screen and built in software makes install and setup easier than ever. A host of multi-rotor craft types are pre-installed, simply select your craft type, check motor layout and propeller direction, calibrate your ESCs and radio and you're ready to go. All of which is done with easy to follow on screen prompts. Input voltage: 4.8-6.0v, firmware version: 1.6: Avr interface: standard 6 pin., ic: atmega644 pa Input rail: single row 2.54mm pitch pin header for input signal Voltage sensor: One red positive pin header for. Input rail: Single row 2.54mm pitch pin header for input signal. AVR interface: standard 6 pin Signal from Receiver: 1520us (5 channels) Signal to ESC: 1520us

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