Cute and cool design with candy crystal Aluminum housing With comfortable earpieces in 3 size ( S/ M/ L) Available from Blue and Pink Drive Unit: Æ 9mm Frequency Response: 20Hz^ 20kHz Impedance: 16© ± 15% Sensitivity ( at 1KHz) : 101± 5dB Max Input Power: 4mW Plug: Æ 3.5mm Cord Length: 1.2m± 10%