AA batteries x3 (not included or USB power, of DC5V: about length side 28 x 20 x 17cm thickness product information power about 57cm package size about 57cm USB cord length about length side 26 x 21 x 20cm in width audio cord length body size Please operate the player side ABS volume: 3.5mm stereo mini-plug Speaker:: 50mm full-range dynamic impedance 8 material: plush polyester / battery box when THD) Input (10% 3.0W:) maximum output . You can not adjust the volume by speaker.
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