Genius introduces a new portable speaker, SP-i177 for its portable speaker series. You can link SP-i177 with other portable speakers to hear loud music wherever you are. It uses an advanced digital Class-D amplifier for clear sound. SP-i177 has a big 40mm speaker unit to bring you incredible deeper bass sound. You can share your favorite music with family and friends anywhere for up to eight hours with the built-in battery. Charging is simple; just plug it into the USB port of a PC/laptop. No adapter is necessary; use SP-i177 with any notebook, cell phone, iPad, iPod, iPhone, MP3/MP4 player or CD player that has a standard 3.5mm audio input. SP-i177 also has a convenient volume knob so you can adjust the volume as you wish. Features include a quick charge USB cable and a pouch for storage.