The small aluminum box is sitting on top of the current size RCexl ignition case. It is half the size and about half the weight of an RCexl unit, and the ignition board and advance board inside. I run a 4 cell AAA nimh 700 pack and get over an hour flight time with it. Lipo's would be even lighter with a 2 cell 7.2 volt pack around 900 mah. Makes it possible to tuck it into a tank compartment since if you are running gas, you only need roughly half the size tank. I am running a Fox .15 on ignition with this setup and it performs nicely. Slight needle adjustments for the 20:1 gas/oil mix but was worth the trouble. A good .46 with a small ignition system will be what we are looking for.

John