Feature: 1. Hobbywing SkyWalker 40A Brushless ESC Speed Controller With UBEC. 2. Regardless the throttle stick position, the motor will not spin after battery connected. 3. Throttle range can be configured to provide best throttle linearity, fully compatible with all market available transmitters. Selectable program setting. 4. Low voltage cutoff conservation / Over-heat conservation. 5. Throttle signal lost conservation. Specification: 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 conservation Features: Low voltage cutoff conservation / Over-heat conservation / Throttle signal lost conservation. Description: Brand Name: Hobbywing Item Name: Hobbywing SkyWalker 40A BEC Constant Current: 40A BEC Mode: Linear mode BEC BEC Output: 5V at 3A Input Voltage: 2-3S Lipo, 5-9 cells NiMH. 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 * 2 cm / 4 * 4 * 0.8 in Package weight: 48 g / 1.7 oz Package list: 1 * Hobbywing SkyWalker 40A Brushless ESC Package List: 1 * Hobbywing SkyWalker 40A Brushless ESC