YKS Upgraded KK2.15 Flight Controller Board built-in LCD Screen w/ Protect Case & Buzzer for RC Quadcopter Multi-rotor The KK2 Multi-Rotor controller is a flight control board for multi-rotor aircraft (Tricopters, Quadcopters, Hexcopters etc). Generation KK2.15 board with updated sensors, memory, header pins and hard case protection. The LCD screen and built in software makes install and setup easier than ever. The KK2 added polarity protection to the voltage sense header and a fuse protected buzzer outputs. At the heart of the KK2 is an Atmel Mega644PA 8-bit AVR RISC-based microcontroller with 64k of memory. An additional polarity protected header has been added for voltage detection, so no need for on-board soldering.