LCD and Viewfinder
Leica M9 has a Fixed Type 2.5" LCD screen with a resolution of 230k dots. At only 2.5", the screen is on the smaller side and 230kdot resolution is lower than most of the recent models in this class.
M9 has a built-in Optical (rangefinder) viewfinder.
Max Shutter speed
Leica M9 can shoot continuously at max speed of 2 fps
and has max shutter speed of 1/4000 sec
Unfortunately M9 doesn't have a built-in flash but it has a flash shoe for mounting external flashes.
Unfortunately Leica M9 doesn't have Video recording ability.
Connectivity and Storage
Leica M9 has a USB 2.0 (480 Mbit/sec) port to connect your camera to other devices.
Leica M9 is powered by a proprietary battery which provides a shooting life of 350 according to CIPA standards.
Considering that the average battery life of Mirrorless type cameras is 363 shots, its battery life is about average in its class but it would still be wise to invest in some spare batteries for long photo trips.
Battery Life Comparison in Pro Mirrorless Cameras
Olympus E-M1X with its 870shots is the model with longest battery life among Pro Mirrorless cameras. Check the comparison of Leica M9 vs Olympus E-M1X or take a look at Longest Battery Life Mirrorless cameras list.
Leica M9 Features Compared to Main Competitors