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My laptop is Asus N552VW which runs Intel 6700HQ for the CPU, it comes with a M.2 SATA SSD model: MZNLF128HCHP-00004 128GB and from what I see, my laptop's M.2 slot is a B+M key slot: More picture...
A few quetions about M.2 Slots : r/buildapc
I have Acer Aspire 3 A315-53G, I want to upgrade my laptop with m.2 SSD. There is a slot for it but the manual of laptop doesn't provide any info on it, I asked official support but the answers are.
Slot machine - Wikipedia
At their core, a slot machine will have a Random Number Generator (RNG), which does exactly what it says it does: randomly generates numbers, which when you spin, generates a certain random combination of symbols across paylines.