You can literally stick this tuner in your acoustic sound hole and leave it there till you either need to clean it or change battery. It's also small enough so it doesn't affect your playing while strumming, picking or playing fingerstyle. It's very precise and you can tune your guitar quickly with it. I think it's a great little gadget and it's definitely a need to have, especially if you hate having so much stuff laying around i.e picks, capo, tuner etc.