Piano Book Twinkle Tunes. Easily portable for young children, this unique toy provides hours of musical fun. Twinkle Tunes features a 1-octave (8-note) keyboard that electronically produces lovely piano sounds, complete with a beautifully illustrated songbook containing a collection of 12 familiar tunes. Requires 2 AA batteries (included). Recommended for ages 3+. Dimensions: 10.5" L x 7.25" W x 3" H; 2.5 lbs.