answer:“One of the limitations of the X10 protocol is the speed at which signals are sent. In general only one part of the signal is sent every 16 milliseconds. That sounds fast but can lead to delays, especially when many devices are being controlled. To improve on these limitations, protocols such as Insteon, BACnet (larger commercial building), Zigbe (www.Control4.com) and LonWorks have been developed. Of these methods Insteon has become very popular in households because of its interoperability with existing X10 appliances.” -Control4.com Also, this powerpoint seems to think Control4 is based off a technology called ZigBee From that I would say that Control4 isn’t utilising X10, but you have to buy X10 Control app for iPhone/iPod Touch anyway, so you’d be better off using the remotes that come with the system.