I wanted a little keyboard so that I could run through my part in music that I am singing with a choir. This light keyboard is perfect as it is easily portable and has the octave ranges that I require, being a contralto. I did have to put in batteries but am careful not to leave it switched on and therefore should find they last well. I was able to take it on holiday with me so it didn't matter too much that I was missing a couple of rehearsals. Because the volume can ne turned right down, it doesn't disturb anyone else. My little grandson also thought it wonderful that there were ready tunes etc. on it! I did think about ordering the transformer so that I didn't need batteries but thought it too costly. Altogether I am very pleased with the mini keyboard - it is just what I wanted!