Another perfect waterproof for 6-12S applications. No BEC....requires receiver pack.  ZTW programming allows for a maximum 50% of full throttle for about a half second if you just hit wide open throttle on your transmitter.  This is normal throttle response in a ZTW.  Aside from just "stabbing" throttle open as you might from a stop in a drag boat, you can expect a smooth throttle response throughout the range of your trigger or stick.