What do you do with obsolete electronic devices?

I was moving some of my stuff our and i have some DVD player, old speakers/sound systems, TV, Microphones, etc. Some of them were given to me long ago and i haven't used them so they're like brand new but unused. If i have to sell it, ill give it a shot but if no ones buying it, i want a back up plan other than just throwing it.
What do you do with obsolete electronic devices?
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