This tiny tuner was smaller than we expected. Comes with batteries so as soon as we placed the batteries and put it on our ukulele we realized that although it is small it is so very powerful, works great, easy to use, easy to set up and super easy to tune up using the scale on the read out. The display is very colorful, bright and easy to read. Super easy to use, our granddaughter was using it and she is 6. Place in your guitar or ukulele case and you have it with you always. Easy to store since it is so small. We were very impressed.