Have a new, never installed Zenmuse H3 2D GCU . Selling this one $100 shipped free (cont. US only) I bought a pair for $200 and am using one on P1 w/new H3 3D gimbal and it works like a charm. So if you're thinking of putting an H3 3D gimbal on anything but a P2 this is what you need. Also if you're looking for an inexpensive PC laptop for assitant software etc.. have an IBM thinkpad R40, windows XP, - DJI assistant software loaded, IOsd mini software. $125 shipped cont US Thanks!