Casio Musical Keyboard CTK-810IN, 61 keys, USB Port, SD memory Card Support

Keyboard (Full)
Keyboard size and number of keys (61).

Touch Response
Changes in volume dynamics can be controlled by the amount of pressure applied to keyboard keys, as with an acoustic piano.

Tones
Number of tones (515).

Auto-Rhythms
Number of auto-rhythms (120).

Built-in Tunes
Number of built-in tunes (100).

Lesson Function
A collection of functions provides more productive practice sessions. Part Cut mutes the left or right-hand part, and Melody On/Off mutes the melody part for play along with the accompaniment. Phrase Repeat repeats a particular phrase. 
3-Step Lesson
3-Step Lesson provides step-by-step guidance. Step Up Lesson for phrase-by-phrase practice of songs, guides you along the way to music proficiency.
Step Up Lesson
You can practice songs phrase-by-phrase, with play advancing only after you master the current phrase. Phrase-by-phrase practice makes the task of learning a new song less daunting. With a Key
Lighting Keyboard, keys light to guide you along the way, which makes
mastering a song even easier!

Recording (Song Memory / Song Sequencer)
Tunes played on the keyboard can be recorded to memory for later playback.

Registration
Keyboard setups, including tone, rhythm, tempo and other settings can be saved in memory for later recall. This feature makes it easy to change the keyboard setup even while playing.

Pitch Bender
Notes can be "bent" by raising and lowering the pitch.

General MIDI
This music data exchange standard for hardware and software makes it possible to intterconnect General MIDI devices, even if they are of different brands.

USB Port
Easily connect to a computer for data exchange.

SD memory Card Support
Use an SD Memory card to store music data and for playback of SMF (format 0) data.

HL (Highly-compressed Large-waveform) Sound Source
Advanced compression techniques make it possible to record high volumes of waveform data and recreate the timbres of various instruments including the grand piano.