No tuning, no hand injury The end of the guitar strings with custom spring tension stud adjustable , the user can adjust the guitar strings according to their own feel arbitrary tightness. And this intelligent guitar's tuning-free function, to achieve the guitar string tension adjustment does not affect the intonation, no need to buy a separate tuner, it is a real gentle guitar does not hurt the fingers! High fidelity CD sound quality:44.1KHZ high sampling frequency and 32-bit sampling accuracy, acoustic guitar and electric guitar tone switch at will, while having two kinds of guitar two kinds of guitars, so you can easily perform folk and rock Rolling two classics. Intelligent self-learning system It has a variety of ways to practice grid climbing, five types of fingered scales, eleven types of chord practice, pre-prompts the playing grade by liquid crystal and metronome, intelligent real-time determination of playing right and wrong, real-time display of scale grade chart and playing right and wrong. Wireless bluetooth connection The smart guitar has a built-in bluetooth BLE4.0 data module that can be bluetooth connection to standard midi-enabled APPs, Creating Versatility More than just a guitar, it's a MIDI controller, which means it can playjust about any instrument you can think of, including compatibility with for GARAGEBAND, for SAMPLETANK,for ABLETON LIVE, and many other applications<br><br>Power input: DC 5V 1A Battery: 2000mAh Endurance : 8-12 h Colour:Black Material:Metal<br><br>Package Contents: 1 x Electric Guitar 1 x Charging Cable<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.