JBL ROXY REFERENCE 230 JBL ROXY REFERENCE 230 The JBL/Roxy Reference 230 Earbud headphones blend Roxy’s stylish aesthetic with proven JBL technology to deliver high performance that looks every bit as good as it sounds. Featuring brilliant orange and pink color, the Reference 230 earbuds deliver high-output sound and excellent frequency response – from virtually any portable device. General Specifications Input Impedance (ohm) : 32 Weight (oz) : 0.38 Weight (g) : 11 Audio Specifications Frequency Response : 20Hz-20kHz Manual