Can i plug 7.4(8.4)Volts in VIN of my arduino nano?

i dont know how to view datasheets etc. nor i can get a good answer to it. what Volts does arduino nano (clone) takes in VIN?

oh and an extra question, can i use 3V3 for powering NRF24L01 2.4Ghz module?

7-12V
But I would keep it below 9volt.
The 3.3volt supply is stolen from the USB chip.
I would not draw more than 30mA from that pin.
But that should be enough for the basic NRF24L01 module.
Don't forget that capacitor across VCC of the NRF.
Leo..

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im talking with ai with the length, wingspan etc and electronics and it said that put a 47nf* 16V electronic condenser to decrease reseting, is it true?

No. Off by a factor 1000. Make that 47uF.
A 47nF electrolytic would be rare and tiny.
Leo..

so i need 47uf and not 47nf?

Correct. Anything between 10 and 100 uF is fine (value is not critical).
Leo..

thanks a lot mate :D