Flag measures 58cm x 54cm whilst the 3 piece pole extends to 1.8m from the end of your arm. 

I used this when boat diving and was very grateful for it when there was any chop in the sea at the end waiting to be picked up, particularly if you dive in a hi-viz black hood like me (and probably most divers to be fair ;-)

The 3 part pole unfolds like a tent pole with elastic holding the unit all together. I had this tucked under paracord attached to my tank so easy to reach and unfold.

Flag is not as new (see pics), but still works as it should.