Cobra XTralite Filter Type_Colour and the locks are good

and the locks are good

smooth focusing and clean diaphragm

and it is a strap

Runs on four AAA batteries (included)

The Nikon D3100 is a compact DSLR camera that shoots 24mp stills or 1080p video at up to 30fps

Cobra XTralite Filter Type_Colour and the locks are goodThe Cobra XTRalite is a compact remote flash unit that provides a touch of extra lighting without wires: it uses a light sensor that triggers when your main flash goes off. Not power adjustable, but definitely powerful enough (still got eyeball spots). Runs on one AA battery (sold separately) but be aware that the battery chamber is pretty tight, so you'll have better luck with non rechargeable batteries.