Connect a smartphone and change your sound with this upgrade of the Otamatone Deluxe and the new OTM Link feature! Our app gives you tons of possibilities! A 3.5mm stereo jack for speaker and headphone output has been added as well. And thanks to a DC jack you can now use an AC adapter and never need to worry about battery life anymore. Functions and size are similar to the Otamatone Deluxe.