Concerning the operation, the battery corresponds to around 8 hours of walking, but in small mode and not connected we lose a few decibels (3-5). It is marked in the record "beats. Lithium can be recharged for a limited number of times "Evident; but not at all reassuring.
Lusage of the device is very simple and handy remote control (especially on a construction site).
But do not look for a variety of functions, all this is simple (play, pause and volume) and by connection (forward, back, stop). Not tested on an i-fone but with Nokia jack connected, the interface is incomplete because it lacks at least one USB outlet. You therefore do not nen hp Dordi, usb key, etc., and that is a shame for such a good product. Ditto for the radio.
The carrying case is handy, but really for the passive transport rather quactif.
Very light and just scratch, she would quickly Sopen to drop it if you venture too lug it around in his hand.
Without i-fone not really pratique..hors the world does not revolve around an apple!
So big regret, from Logitech that regresses in the design of its devices (radio pregnant or should know)
Deserves a 3 star rating which remains a good score anyway.