Although some of the reviews write here the device would be silent in standby, I nevertheless had to realize that this is not so. You can hear clearly the buzzing of the power supply in standby. I did this then "corrected" by the incorporation of an intermediate switch in the power cord.
Otherwise, there is nothing to fault with the device in this price checkout. In particular, the MP3 (Stick) function is quite well - even if the device detects only sticks with FAT32 file format.