Normally we would compare the device to other similar devices. Unfortunately, we don't really have much to compare the Flex to. How about a half dollar?

The Flex may be slightly larger than a half dollar (though smaller than half a dollar bill), but it will cost you 200 of them.

The back of the Flex reveals the model number, FB401, and provides a nice insertion arrow. It's not quite disassembly information, but it's something, right?