The person who said you have no way of knowing that electronics work is completely wrong. They have outlets so you can plug them in and see if they work. Also they have cd's and tapes that you can put into cd players and tape players to see if they work. So it is your responsibility to check if the item works. Especially because they have so much comming in all the time and are a non-profit org. they cannot spend money on checking if every item woks. Thats the great thing about the DI, its cheap, but you have to understand that alot of the stuff is crap.