Recommend to set the ESC Throttle Ranger in first time to use or change a new transmitter.
Setting Ranger:
Open your transmitter, push the throttle stick to the highest, then power on the ESC, you will hear "Di" then pull the throttle stick to the lowest, you will hear "DI DI" 2 tones, the throttle range set completely.
Feature:
Model: HeeWing 25A Brushless ESC
Inout:2-6S
Output:25A
UBEC:Non
Size: 29*15*5mm
Cable Length: Power cable 170mm, Single Cable 170mm
Weight:4g