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This is a new 3 in 1 controler board for electric helicopters Gyro, Electronic Speed Controler as well as Mixer Allows you to convert a Walker 4 or any heli with a 4 in 1 board to be used with the Transmitter / Receiver of your choice eg JR Fataba etc giving better range and less glitching.
I have converted a walkera 4 and am usuing a JR TX - RX combo works like a dream
Size 35mm x25 mm