Another perfect waterproof for 2-6S applications. Has BEC....no receiver pack required. 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.