The Pentium-40A ESC belongs to Hobbywing's "PLATINUM" series product line, and is the most significant top-class product for RC aircraft and helicopters. 

Typical Applications:

Suitable for use in typical 450 size helicopters and small aircraft that use standard 40A speed controllers.

2S - 6S LiPo compatable (5.6V - 26v input)

Specifications:

Output: Continuous 40A, Burst 60A up to 10 Secs.
Input Voltage: 2-6 cells lithium battery or 5-18 cells NIMH battery.
BEC: Switch. BEC Output: 5.25V or 6V, 3A

Control Signal Transmission: Optically coupled system.
Max Speed: 210,000rpm for 2 Poles BLM, 70,000rpm for 6 poles BLM, 35,000rpm for 12 poles BLM. (BLM: BrushLess Motor)
Size: 59mm (L) * 27mm (W) * 12mm (H).
Weight: 38g.

Features:

(1) High performance microprocessor brings out the best compatibility with all kinds of motors and the highest driving efficiency.
(2) Wide-open heat-sink design to get the best heat dissipation effect.
(3) With 3 types of start mode: Normal / Soft / Very-Soft, compatible with aircraft and helicopter.
(4) Smooth, linear, quick and precise throttle response.
(5) Multiple protection features: Low-voltage cut-off protection / Over-heat protection / Throttle signal loss protection.
(6) The output voltage of the built-in BEC is switchable by user programming (5.25V or 6.0V).
(7) Perfect governor mode for helicopter.
(8) The firmware of the ESC can be updated through the USB adapter on the Professional LCD Program Box.
(9) User programmable. Several kinds of program methods are supported: transmitter, digital LED program card, advanced professional LCD program box, PC software. Very easy to program the ESC at home or at the flying field.