Which gen?

[sparklebox]

Hi, noob question here I'm sure, I got a 16gb ipod nano in black with video for my birthday in October 2009, I need to buy a new USB charger and mains charger. Though I'm unsure which generation my ipod is. It doesn't say on the box and I just got confused when I googled!!
Can anyone tell me what it is??
Sorry and thanks!
Bex

 

[Fillado]

This