.... This MP3 recorder Olympus WS 550M, I used it today for the first time, I hesitated to buy it and that's the comment of the first user who convinced me, for I owned WS 300M for 3 years and was very moderately satisfied, this one is much more functional with the front panel controls, the risk of incorrect operation is no longer possible as the WS300M whose orders were on the side, he greater recording capacity and good quality STXQ mode without micro and cheaper by 60 euro and 30 euro on Amazon compared to supermarkets, I was delivered in three days as planned, and must The supplied battery is rechargeable via the PC it is more economical, the previous wore a battery in 8 to 10 hours and especially infinitely more environmentally friendly, and that I like a lot, it deserves 5 stars.