On page one the instruction book says 'Magically amplifies the sound from iPhoneTM, etc'
Yeah, it kinda does.
I popped3 AA batteries into it and turned it on. There are no wires. Picked a song on my iPhone (We Will Rock You, if you must know) and put the phone on top of the BOOST. Big time difference! Pretty good sound and much louder, better than the tiny, tinny speaker built in to the iPhone. Next up was the final movement of Saint-Seans Organ Symphony. Thunderous Bass? No. Good sound? Yes. Last iPhone test: Foggy Mountain Breakdown. (What?) Sounded great (and don't give me comments that say 'if it makes banjo music sound great it must be magic. Just don't).
Next up, my Kindle Fire. Phil Collins. Worked great.
Cordless phone? Not so much. But I can't figure out why I would want to do that anyway.
So, to sum up: for pop/rock/country music it works great. Very good for classical music, especially if you remember you are using a $30 device. Portable and fun. Seems to work with any device that plays music and has a built-in speaker. My 18 and 11 year-olds thought it very cool.
I am going to have fun with this.