flash – Meike MK-910 + Nikon D3300

I have a Nikon D3300 camera and decided to step up the purchase of an external flash. As my budget is very tight, I would opt for the SB-100 "alternative" – ​​Meike MK-910.
My question is whether the flash and the body are compatible in both directions;

a) Is the communication ttl reliable?

b) how to use the off camera flash (as a slave). Does it work directly or do I have to buy a transceiver?

Thank you.