This is the solution you need for plugging professional XLR mics into anything that lacks an XLR port. It works with DSLRs, tablets, computers, and even phones. Essentially all you need is a 3.5mm input port and this will plug right in. It can tell whether you need TRS or TRRS output and adjusts automatically.

Even if your mic requires phantom power (such as with a condenser), that's no problem. This unit can supply +48V for that purpose. You also get adjustable input gain control as well as a headphone jack (3.5mm) for real-time direct monitoring.

It is conveiently powered off 2 AA batteries that give up to 20 hours of runtime (~7 hours if using phantom power), so you don't have to worry about the unit cutting out mid-shoot.