In the main amazon description above highlighted with flexible power it says a power supply & terminal block is included, is it included?

Yes, the IES81GW includes a universal power adapter (NA/JP, UK, EU, ANZ) and a terminal block connector. Atha, StarTech.com Support

Is this switch allows for PoE(passive) devices connected? If yes, could specify voltage?

No, the IES81GW does not support PoE output. Matt, StarTech.com Support

Is there an AC power wall adapter for this?

No, this product does not come with a power supply. You either need to use a DIN rail power supply or a different adapter. I used this product "KNACRO AC 100-240V to DC 48V/3A 48V 3A 144W Power Supply Adapter AC Switching Power Transformers Interface 5.5 x 2.5mm Suitable for Routers switches control systems" available on Amazon.

What sfp modules are compatible?

Our IES101GP2SFW will accept the vast majority of Gigabit, MSA compatible, SFP modules that support the IEEE 802.3z 1000Base-SX/LX industry standard. For example, our J4858CST and SFPG1320C would work. Brian, StarTech.com Support