Hobbywing 8A Switch-Mode UBEC Max 15A Speed Controller ESC For RC Airplane Helicopter RC Aircraft Designed with an advanced switch mode DC-DC regulator IC, the max efficiency of the chip is up to 92%. Large output current - continuous output current is up to 8A, and the burst output current is 15A. Features output short-circuit protection function, and an over-heat protection function. Uses a metal shield, covering nearly all the electronics, and a special filter to dramatically reduce electromagnitic interference. Automatically detects cell count (2 cells or 3 cells), and shows battery capacity with 4 indicators (LEDs).