Yamaha's CSF-TA is a TransAcoustic parlor acoustic. 

The TransAcoustic delivers a sound and feel like no other, with onboard reverb and chorus effects, courtesy of Yamaha's groundbreaking TransAcoustic technology. 

TransAcoustic simulates the resonant qualities of an acoustic being played in a rich, ambient room, all without an amp or PA. Instead, the built-in reverb/chorus effects work together with a built-in actuator that vibrates the guitar's body in sync with the natural resonance generated from plucking notes, delivering a full-bodied sound without needing to plug it in. 

Thankfully, you can still get great acoustic-electric tones with the CSF-TA, thanks to the guitar's System70 + SRT piezo pickup system, and with the included hard bag, it's easy to keep safe. With the added resonance of Yamaha's TransAcoustic technology, the CSF-TA is a remarkable parlor guitar.