Commodity: Portable Hand Rolling Piano Model: HY-1011 Packing: color box Specifications: (ctn measurement) 58.7*47.5*29cm Rated voltage: 3.7V-6.0V Power supply: 1.5V* 4 batteries / 6V adapter Features: 1. Novel in design, carry conveniently and easy to operate. 2. It made by new-type & hi-technology silica gel material, can be rolled and portable. 3. There are 49 keyboard, 30 English DEMO songs and 100 kinds of tones.