The Korg Clip-on tuners can be placed directly on your instrument for quick and easy tuning. The light and compact design can be rotated in many ways so that it can find a place on any instrument. Even if that spot is a bit further away, the LCD screen remains easy to read. The AW-LT100M works on one AAA battery for about a hundred hours. As a unique feature, the AW-LT100M has two measuring speeds: Fast and slow. Fast can show as you play how clean the note is and slow for typical pre-tuning.