Mobile Mini Speaker, connects to iPod, iPhone, notebook computers, MP3 and portable CD/DVD players, hand-held games & more, Manhattan 161107 Compact 3.5mm Jack Rechargable Frequency response (amplifier): 100 Hz C 18 kHz Speaker frequency response (speaker): 300 Hz C 18 kHz Signal to noise ratio (S/N): 83dB Power output: 2.4 W Diameter, driver: 5.2 cm (2 in.)