Panasonic RP-HJE50's sleek in-the-ear design fits snugly yet comfortably allows you to enjoy music during activity. The closed-type earplugs style reduces outside noise for high-intensity listening; generating a powerful resonant bass response akind to a sound-proof environment signature Panasonic Bass as they are well known for! Comes with quality silicon earbuds which reduce outside noise provide long-lasting comfort hour after hour washable removable replaceable and the supplied three sizes of earbuds (S/M/L) accommodating a full range of ears. Even with the small 11.5mm drivers Neodymium achieves 104 dB of sound pressure output from a modest 1 mW input power. Specifications : Lateral In-the-ear Closed Dynamic Earplug System 11.5mm Neodymium Magnetic Drivers OFC; Neck Chain 0.5m (remote friendly) Cord & 1.0m Extension Gold-plated Stereo straight mini plug 16 ohms at 1 kHz impedance 104 dB/mW sensitivity 200mW Power handling capacity Wide 6 - 25 000Hz Freq. Response