only 3 was non functional,
i wanted to to return those 3 only, seller initially said about repairing them, I then stopped getting replies on eBay when I said that 1 he sent had auto iris, because he tried to say that model doesn't have auto iris at all.
so I opened a PayPal case requesting refund, he immediately declined the refund then said Immediately after I could send back for a refund or replacement.
so I tried to work it out with him, then he backtracked and started saying he would try and repair and replace if couldn't be repaired only.
because they are brand new unused units I didn't want a repair done, and he was always saying 1 thing then another so didn't want to take risk he would send me more faulty units in replacement because I can't reopen a case on them.
so I escalated it to PayPal, and requested a refund only on the 3 non functioning units.
paypal said I had been awarded a refund of the full amount instead, so that's why I've got to return all of them.