ammoon 21" Acoustic Ukulele 15 Fret 4 Strings with Spruce Stringed Musical Instrument with Built-in EQ Pickup 21" size, suitable for both kids and adults. Body is made of spruce, compact and light-weight. Built-in 3 band equalizer(treble, bass, volume ). 6.35mm output can connect to sound amplification equipments externally. Exquisite workmanship, carved sound hole, elegant brims.