I use it in a moving wagon. I sing melodies and use a wireless UHF microphone with the device. I accompany myself on the banjo, acoustically. I have the 18w model but I went with this one because it was 25w. I like the location of the volume control, the echo effect function can only be added a little so that the sound isn't terrible. I've used it all day without charging, it's a shame there's no way to tell how much it's draining, the 18W has a digital display of the charge remaining. I left the headphones on during a break and there was no power, but the headphones charge fairly quickly. 18W is a warmer sound quality, but I use 25W as my first choice, mainly for the convenience of volume control. I prefer the 18w case because I know I'll scratch the shiny 25w case, but it's looking good now, I've used it for four days. (Start a new exercise every day)