KK2.1 Multirotor LCD Flight Controller With Atmega324 PA KK2.1.5 KK21EVO Flight Controller With Large LCD Second MPU Description: Size: 50.5mm x 50.5mm x 12mm Weight: 21 gram (Inc Piezo buzzer) IC: Atmega324 PA Gyro/Acc: InvenSense Inc. Auto-level: Yes Input Voltage: 4.8-6.0V Signal from Receiver: 1520us (5 channels) Signal to ESC: 1520us Firmware Version: 1.6++ Built-in airplane mode: Dualcopter Tricopter Y6 Quadcopter + Quadcopter X Hexcopter + Hexcopter X Octocopter + Octocopter X X8 + X8 X H8 H6 V8 V6 Aero 1S Aileron Aero 2S Aileron Flying Wing Singlecopter 2M 2S Singlecopter 1M 4S Package included: 1 x KK2.1 Multirotor LCD Flight Controller