Collocations for gadget - noun

little, small
mobile, portable
clever, cool (informal), handy, neat, nifty (informal), useful
must-have
latest, modern, new
high-tech
We live in a world filled with high-tech gadgets.

digital, electrical, electronic
kids that hassle their parents to buy the latest electronic gadget

wireless
expensive
consumer (esp. AmE)
household (esp. BrE), kitchen

use
design, develop, invent

lover
freak, geek (esp. BrE)

gadget for
She has invented a nifty little gadget for undoing stubborn nuts and bolts.