61 full-sized keys are great for learning and developing keyboard playing technique.</br>Duo mode splits the keyboard into two halves?? each with their own "iddle C" for practicing with a partner</br>The Aux Line Input allows you to connect any music device with a headphone output?? such a"an MP3 player?? a computer?? a mixer or even another keyboard?? and hear it through the internal speakers. The Portable Grand button and instantly resets the keyboard to the grand piano Voice</br>32-note polyphony allows for the performance of beginner to advanced level pieces?? allowing for sustained notes to ring through without being cut off.</br>The PSRE253 operates on batteries or with a power adapter. NOTE - Power Adapter is sold separately.</br></br>Product Description</br></br>The PSR-E253 is Yamaha's entry-level Portable Keyboard and features a wide variety of sounds and functions. The Yamaha Education Suite can be used with the 100 preset songs?? making it the ideal first keyboard for aspiring musicians who are just starting out. Fe