Automatic Tuner / Motorised String Winder- Completely automatic- High-resolution 135 x 240 pixel LED color display- Just put it on the tuning peg, strike the string and watch how it is perfectly tuned in seconds- Works with all guitar-like machine heads, including electric, acoustic, classical and steel guitars, ukuleles, mandolins, banjos, etc.- The latest generation of vibration detection gives the Roadie 3 unsurpassed noise immunity and accuracy when tuning, even in noisy environments- Selection from more than 100 preset, alternative and open moods - your own moods can be created with the optional and free app- Quick and easy winding of new strings with the automatic winding function (120 rpm)- Power supply with the included rechargeable lithium polymer battery with charge status display- Integrated vibration metronome- Easy synchronisation via bluetooth with free iOS and Android application- Connections: USB-C- Dimensions: (W x D x H): 51 x 25 x 89 mm