This is NOT compatible with Mac. Transistors die after two years, cheaper on Amazon. Already bought 2, worked well until they broke. Amazing quality, would have thought it was 1080p with HD radio. Windows 7 loads, but looks like Mac OS 7.6 for some reason. Can’t dual boot, but the traction it gets is amazing. Lights last forever, with the brightness of an angel. I’d say buy 3, if only for the extra straps! My kid uses this instead of a lunchbox every day, and has had no ill side-effects, plus all the other kids want one too. The lack of voice modulation is a drawback, but it makes up for it in sheer strength. Also, this is NOT recommended for the elderly or infirm. YES compatible with iPhone 3gs, but it has to go in airplane mode or you may be interrupted by phone calls. If you try to take it underwater, the signal gets worse before it gets better.