Iris + won't arm

I have an Iris + using a Spektrum satellite and DX9 radio. I can only get the Iris to arm and motors run when the Iris is connected to my computer via USB (plus with LIPO plugged in of course).

If I go through this procedure without the USB cable atta

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3DR Iris + Propeller Set

I have just purchased a second hand 3DR Iris + without propellers. Can someone please give me advice on here I can get the correct propellers for this.

Many thanks

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