GoolRC 4 Pcs Original Hobbywing SkyWalker 40A Brushless ESC Speed Controller With BEC

Features:  
Safety Arming Feature: Regardless the throttle stick position, the motor will not spin after battery connected.
Throttle Calibration: Throttle range can be configured to provide best throttle linearity, fully compatible with all market available transmitters.
Selectable program setting
Full Protection Features: Low voltage cutoff protection / Over-heat protection / Throttle signal lost protection.

Description:
Brand Name: Hobbywing
Item Name: Hobbywing SkyWalker 40A UBEC
Constant Current: 40A
BEC Mode: switch mode
BEC Output: 5V at 3A
Battery Cell: 2-4 cells Lipo,or 5-12 cells NiHH
Dimension: 68 x 25 x 12 mm
Weight: 43g
Maximum speed: 210000 RPM (2 poles motor), 70000 RPM (6 poles motor), 35000 RPM (12 poles motor).
Usage: Apply for 400/450 helicopter 3D, and 32 level fixed wing sports

Package size: 10 * 10 * 5 cm / 4 * 4 * 2 in
Package weight: 192 g / 7.05 oz

Package list:
4 * Original Hobbywing SkyWalker 40A Brushless ESC