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The Hobbyking ESC's high power BEC has been specifically designed for extreme aerobatics 40A SBEC. 40A. 60A. 5-18NCV. 2-6. Lipo. 32. 5.5V/4A. 23 x 52x7.The Hobbyking ESC's high powerBEC has been specifically desi-ened for extreme aerobatics and therefore has the capability to support the hi,qher momentary HK Hobby King 40A ESC 4A UBEC (18966) Note: User manual can be downloaded from the files Tab. PRODUCT ID: F-40A. Download. Customer files. The output voltage is 5.5V. The load current of steering engine is 4A. At the moment of 2 seconds can reach 8A. 2） The ESC with UBEC supply steering engine Buy HobbyKing 40A ESC 4A UBEC online at an affordable price. Get special offers & fast delivery options with every purchase on Ubuy; Hobby King 40A ESC 4A UBEC. Note: User manual can be downloaded from the files Tab. Product Specifications · Videos. Upload video. Thanks for purchasing our Electronic Speed Controller (ESC). High power system for RC model is very dangerous, please read this manual carefully.