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The black version of the Sennheiser CX 1.00 Earphones offer an ultra compact ear canal coupling design with a dynamic transducer to deliver a frequency response of 17 to 20,000 Hz with a THD of less than 0.5% and a maximum SPL of 119 dB. The earphones feature a right angle 1/8" (3.5mm) plug for connecting to your smartphone or other mobile device. They come with a set of four ear adapter sizes (XS, S, M, L) to accommodate ear canals of different sizes.