I don't have an M10, but as far as I know it has a 1/8" TRS stereo jack for external mics.
The DR-40 has a pair of combined XLR/TRS jacks to which you can connect external mics, they
can supply 48v phantom power, but not 5V Plug-in power, so to use small stealth mics. you
would need a battery box to provide the power.
If you intend using high quality professional condenser mics that require 48V power, then the
DR-40 is a good choice, it runs for about 5 hours with 2 Phantom powered mics, on 2300 mA/Hour
rechargable batteries, and about 12 Hours with Phantom Power switched off
Jon.