Here are the details of the specifications featuring in these 3 devices.
With dimensions of 153.69 x 76.2 x 6.9 mm and weight of 156 grams is a budget smartphone with Single SIM ( Micro SIM ) with 5.5 Inch 1080P resolution of 401 PPI pixel density will make the images looks superb and also with 13 MP Rear Camera with HD video recording support with Dual LED flash which will help in low light and also with 5 MP front camera will prove its worth. Featuring Quad Core processor clocking at 2.5 GHz with Android Lollipop featuring on it is a bit concern, as Lollipop is unstable in this devices.With 2 GB RAM, you can get your work done and also with internal storage of 16 GB and also has Memory Card option which supports up to 64 GB and has a battery of 2600 mAH which is a bit low and I doubt it can't sustain a working day.
Available in Snapdeal for Rs 10,999 and for Rs 11,999 in amazon ( India).
With Dual SIM support with dimensions of 156 x 76.8 x 7.2 mm of with similar Display of 5.5 inches and 1080P screen as of Infocus M810 and also features the same camera the only difference is the front camera which is extended up to 13 MP. Processor featured is an Octa-core clocking at 1.5 GHz and rest of the specifications are similar to that of Infocus M680.
Price of this is Rs 10,999 available in Snapdeal
Meizu M2 Note
With similar specifications as of Infocus M810 in terms of dimensions and display and also the camera, the only change is it has support for video recording at 2160p@ 30 fps. With Android Lollipop and with Octa core Mediatek processor is a bit worry clocking at 1.3 GHz and RAM is of 2 GB and internal memory of 16 GB and has memory card slot and supported up to a whopping amount of 128 GB and also has a killer battery of 3100mAh.
Available at Rs 9,999 in Amazon ( India ) and for Rs 11,699 in Ebay.
Though everything looks fine each of the devices has some low in one aspect and fails to bring that equilibrium in that specifications. So out of these 3, I would suggest to go with Meizu M2 note and at this price range you can get Moto G2 or G3, you can go with that for more reliable performance.