4.5 Makes a lotta Sensa... M0nsterHunter | 10/06/2009 | See all M0nsterHunter's reviews (20) This is one of my favourite "little" toys; I take it everywhere - I usually clip it onto my watch strap and just use it whenever! The battery lasts for a long time - I flew out to Orlando recently (9 hour flight), used it for a few hours before take off and for most of the flight and there was still 50% charge left - they estimate around 15 hours and I think they are right. One of the reviewers had a problem with a car stereo detecting the device - I can't be sure but this may be down to some piece of DRM jiggery-pockery that Microsoft insist get put onto these types of devices. This DRM stuff is not a big deal in general and you can just drag and drop music files onto the Music folder as you please. There is a setting that the unhappy reviewer can play with to see if their car stereo will pick the Sansa up- basically if you click on "Home - Settings - USB Mode" there are three options: AUTO, MTP and MSC, As I use mine pretty exclusively on PCs, I just keep it on "AUTO" - in your car maybe set it to MTP or MSC - that might just fix your issue?In summary, you can play audio files, audio books, use it as a voice recorder (built in mike) or just as some nice USB memory (the display is also useful). We've got through probably around 4 iPod Shuffles over the last few years (they seem to last around 12 months) but Ive had my Sansa for over two years with no issues.