Overview: The KK2.1.5 PLUS Flight Controller is equipped with an integrated power distribution board (PDB), on-board switch, and buzzer for streamlined installation and convenience. The advanced self-balancing feature ensures smooth and stable flight, making it ideal for both beginners and experienced drone enthusiasts. Powered by a reliable Atmega module and features gyro from InvenSense Inc., and accelerometer from Anologue Devices Inc. The flight controller accepts firmware updates, offering compatibility with V1.19S1PRO or OpenAeroVTOL 1.5/1.6 for enhanced performance and features. All settings and adjustments can be made directly on the flight controller's built-in LCD screen with four buttons, eliminating the need for a separate computer unless a firmware upgrade is necessary. Specifications: Item Name: KK2.1.5 PLUS Dimensions: 52mm x 52mm x 12mm Weight: 19g Integrated Module: Atmega Gyroscope: InvenSense Inc. Accelerometer: Anologue Devices Inc. Self-Balancing Feature: Yes Input Voltage: 2-6S lithium battery or ESC-BEC 5V, but it is not allowed to provide two power supplies to flight control at the same time Output BEC: 5V 2A Receiver Signal: 1520us (5 channels in total) Signal to ESC (Servo): 1520us Firmware: V1.19S1PRO or OpenAeroVTOL 1.5/1.6 (Flash via USB Programmer) Default Firmware: V1.19S1PRO Built-in Airplane Mode: Twin-rotor Tri-rotor Y6 four-axis + four-axis X Six axis + Six axis X Eight-axis + Eight-axis X X8 +X8 X H8 H6 V8V6 Aero 1S Aileron Aero 2S Aileron Flying wing Single axis 2M 2S Single axis 1M 4S V-tail four-axis English Manual, Click Here Flight Controller Version Included: 1x KK2.1.5 PLUS Flight Control 1x Cable Flight Controller + USB Programmer Version Included: 1x KK2.1.5 PLUS Flight Control 1x USB Programmer 1x Cable