Hi Scott,

Go read my thread in the parkflyers forum on the two Aerobird X-tremes that I am reviewing along with the Aerial Drop and Combat Modules. It contains some details now and will be updated again soon as we continue testing.

The reason for a sonic sensor is because infra-red sensors don't work well in sunlight. The Sonic Combat Module can be used on ANY HobbyZone plane that has an X-port.

We were delightfully surprised at just how much fun these modules were and also how well they worked.