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, 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. 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: B: OpenAeroVTOL 1.6 (Flash via USB Programmer) 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 Due to different batches, there may be differences in product appearance, The colors of buttons and other small parts , which will not affect the use Colour:Black Material:PCB Package Contents: 1 x Flight Controller Board Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.