Yes, Micromax Canvas Infinity is a true 4G VoLTE phone.
No. Micromax Canvas Infinity does not have the IR Blaster.
No. Micromax Canvas Infinity does not have the fast charging or dash charging. You need to buy Sony CP-AD2 fast charger if you want fast charging.
Yes, Micromax Canvas Infinity does have a dedicated MicroSD card slot. You can use 2 sim cards and 1 memory card at the same time in this phone.
No. You will get normal charger only in the box. However, you can use Sony CP-AD2 charger to charge it much faster than the original charger.