Hall Effect Thumb Throttle 

This well made Thumb Throttle comes with a 1M cable and the plug will fit most Chinese electric Go-Karts and electric Bikes. Its a pretty decent quality with good rubber grips.
Specifications: Operating Voltage: 5V Output Voltage: 0.9V-4.3V Cable Length: 1M  
The voltage range (approx.) is 0.9V-4.3V, so hooking these up to any standard Chinese controller should work fine. Fits a standard size handlebar, and can be tightened for adjustment. Note: Our controllers are built to accept these Hall Effect throttles.
 
 

 

You can see the adjustments available on the thumb throttle here.
 

It uses the same connector as most Chinese controllers.