The RG351M is one of the best handheld in the market. The build quality is excellent and the console is very comfortable to play with. The Emulators in the RG351M work perfectly well if you want to emulate PS1 and older systems. The screen on this console is not the best, but it is perfect for GBA, and not bad for other systems. The speakers are clear and loud.  Also, you will get between 6 and 8 hours of playtime on the battery.

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What the difference between the RG351P and RG351M

The P in RG351P is for plastic and the M in RG351M is for metal. Therefore, RG351P comes with the plastic shell. It is older and cheaper than the RG351M that came with the metal shell or Aluminum alloy shell. A Wi-Fi module is built in the RG351M which is great to upload files wirelessly. However, you can still buy a mini Wi-Fi Adapter for the RG351P. 

RG351M and RG351P Operating System

Right out of the box, the RG351M came with a beautiful Operating System, and it is preloaded with ROMs. You can add or remove games and images with the built-in Wi-Fi module. There are other Operating Systems available for the RG351 P and M consoles. For example, the 351ELEC 2.0, ArkOs and Batocera. However, all RG351 consoles come with EMUELEC firmware or operating system. Ever single of these operating systems are lightweight and Linux base. 

Storage for the RG351M 

According to ANBERNIC official listing page for the RG351, RG351P, and, RG351M. All these consoles come with 2500 games or ROMs and 64 GB Micro SD Card for storage. However, the user can add up to 256 GB Micro SD Card for more storage. 

RG351M Pros and Cons

Pros:

Build Quality

Reliability

Performance

Cons:

No HDMI OUT

Only Two Color Options

Specifications:

Color: Matte Black and Space Gray

Material: Aluminum allow shell, CNC process

Screen: 3.5 inch IPS screen, OCA full lamination/ 320*480

Built in Emulators: 

NDS, N64, DC, PSP, PS1, CPS1, CPS2, FBA, NEOGEO, NEOGEO POCKET, GBA, GBC,GB, SFC, FC, MD, GG, MSX, PCE, WSC, AND A FEW MORE.

Language: Multiple Languages

Speaker: High quality double horn stereo speaker

Battery: Li-polymer 3500 mAh, lasting 8 hours or less

Storage: Support TF Card or Micro SD Card up to 256GB

Charging: 1.3A charging/ matching maximum load 2A/ USB charging cable/ Less than  hours to fully charge the device

CPU: RK3326 quad-core 1.5GHz

GPU: Mali-G31 MP2

RAM: DDR3L 1GB

Memory: 64GB

Other Features: Vibrating Motor for a strong sense of vibration