Concert ukulele: suitable for beginners, professionals, adults, teens or kids | High-quality materials: T700 carbon fiber composite material and ABS material create a sturdy and durable body, keeping you traditional feeling | Intelligent guidance: can be connected to APP (Populele) for free learning and practice. 56 LED lights are equipped on the fretboard to indicate the chord position | APP functions: the APP has a constantly updated music library, and also supports ensemble songs with other people to achieve your band dream | Lightweight & portable: 23-inch design is suitable for adults and kids. Up to 10 hours of use time allows you to play anytime and anywhere