KK 2.1.5 LCD Multirotor Flight Control Board KK2.1.5 Newest V1.19Pro Quadcopter KK2 6050MPU 644PA Free Shipping KK2.15 KK2.15 Multi-rotor LCD Flight Controller V1.9S With Protect Case Box Features: The 2.1.5 is functionally the same as the 2.1. Some minor changes have been made to the board including: More Silk screening has been added to delineate polarity and functionality Ground is now pulled from the Escs which provides better reverse voltage protection. Diode protection has been added to the buzzer to avoid damaging the board if you plug in power to the buzzer Improvements have been added to the voltage sense accuracy Specifications: Size: approx. 36mm x 36mm x 15mm IC: Atmega644 PA Gyro/Acc: 6050MPU InvenSense Inc. Auto-level: Yes Input Voltage: 4.8-6.0V AVR interface: standard 6 pin. Signal from Receiver: 1520us (5 channels) Signal to ESC: 1520us LCD size: 24*18mm Voltage sensor: One red positive pin header for. Input rail: Single row 2.54mm pitch pin header for input signal Package Included: 1 x Mini KK2.15 Flight Controller with protect case