The Casio SA-77 is a mini keyboard designed for beginners and children. It features 44 mini keys, 100 built-in tones, and 50 different rhythms. The keyboard also has a built-in microphone, allowing users to sing along as they play. It also comes with a variety of features such as the ability to transpose and tune, play with one finger or with 3-Step Lesson function. The SA-77 can be powered with batteries or an AC adapter, making it portable and easy to use on-the-go. It weighs approximately 1.4 kg, and the dimensions are 604 x 211 x 57 mm.