This is AprilYang's Dual Kalimba Pro model. It's the latest model. You can change the tone with a switch (6 built-in tones). The keys are new, rounded ones. All sounds are heard from the earphones. (The sound of the high C is slightly weak, and sounds a little shorter compared to other notes. Please be aware of this, as it may not be noticeable depending on the effect.) Although unused, there are many scratches as it is made overseas. Please understand. [Included Items] Audio cable Charging cable Earphones Tuning hammer Tremolo chain Cleaning cloth Charged and operation confirmed. Insert the earphone plug into the main unit and long-press the button to light up the logo and turn on the power. Press the switch to change the tone (6 types). To turn it off, long-press the power button as well. Operation has been confirmed and will be shipped. In the unlikely event that it does not work, we will handle returns and refunds. (Returns are not accepted for reasons other than operational defects) Scratches can be seen on the main unit and keys. Please understand before purchasing. / The April Yang Board Kalimba 17 keys provides rich sound quality and can be connected to external speakers to amplify the music. It also enables dynamic musical performance. Perfect for players of all levels.