Extension stubs and cables may be used to add physical separation between the EMT module and your phone or tablet.
USB Extensions Stubs
If you have a phone or tablet with a case that interferes with the Echo Meter Touch, then you need a USB-C or micro-USB extension stub. Each new Echo Meter Touch module ships with a complementary USB-C extension stub.
If you do not already have a USB-C extension stub, you can purchase one from many different electronics retailers. All brands we have tested work, though we have had occasional reports of ones that don't, so you will have to test after purchase. Extension stubs usually do not claim OTG compatibility and it is not necessary for an extension.
USB Extension Cables
An extension cable can be used to mount the Echo Meter Touch module away from your mobile device. If your device has a micro-USB connector, then you need a micro-USB extension cable (female micro-USB to male micro-USB). If your device has a USB-C connector, then you need a USB-C extension cable (female USB-C to male USB-C).
Most USB-C extension cable brands we have tested work fine. Look for a cable that specifies that it is designed to transfer data and not just power.
We have had less success with micro-USB extension cables. About half of those we have tested work and half don’t, and even the ones that do work don’t usually mention data transfer. You will need to purchase and test to be sure.
Extension cables do not require OTG compatibility.
Lightning Extension Stubs
An extension stub is necessary to plug the Echo Meter Touch module through many phone cases. Apple does not sell a stub extender and third-party brands of these stubs tend to come and go so we cannot make specific recommendations. The best chance of success is with a stub that claims to be “Apple MFi certified”.
Lightning Extension Cables
A Lightning extension cable can be used to mount the Echo Meter Touch module away from your mobile device. As with the stubs, there is not an Apple-branded extension cable and brands tend to come and go so we cannot recommend anything specific. The best chance of success is with a cable that claims to be “Apple MFi certified”.