The casio ct s1 76 key portable keyboard and bluetooth dongle is a great way to achieve portable playing with the added benefits of bluetooth technology. Weighing just 4.5 kg its lightweight and perfect for travel without compromising on sound quality. The 6.5w bass reflex speakers add depth to bass notes enhanced by the redesigned casio aix sound source. The ct s1 keyboard features design elements uncommon at this price point like speaker cloth and felt in the keys. Its uncluttered layout and 61 voices make it a joy to use offering a mix of modern and classic sounds including vintage instrument samples. The bluetooth dongle lets you turn your keyboard into a bluetooth device. This allows you to play along to songs on your device or use your keyboard as a speaker. The casio ct s1 76 key portable keyboard and bluetooth dongle is an ideal choice for any beginner or intermediate player looking for a reliable keyboard.