How do I keep the earphones from falling off the pins?

Make sure cable pin is completely connected into earphone, when you hear a "click", it means MMCX pin is fully connected. If 2pin connector has the issue, please let us know. We will arrange a replacement for you under the specific situation

Do you have cable can connect apple iphone?

Sorry there is not a iem cable can directly be connected with iphone, you may need to get an apple dongle,there are several IEM Adapter Converter for iPhone, iPad, iPod, we recommend you this one: Linsoul DD HiFi TC35i

Are the pins in the recessed 2pin 0.78mm or 0.75mm

The diameter of recessed 2pin connector is 0.78 mm,it fits for KZ and CCA earbuds with QDC connector.

How do I know orientation of pins? Is there a marking to show which side should go on outside?

The red pin goes in the right channel, the blue pin to left. After inserting them, use a test CD or Internet channel test for right and left. If the sound is incorrect, sap the cables.

Tripowin Zonie IEM Cable, 16 Core Silver Plated Earphone Upgraded Cords, 1.25m SPC in Ear Monitor Cable for 7hz Zero:2 Orchestra Lite Cadenza Hype4 Supermix4(2pin 0.78mm, 4.4mm)(Gold)

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