Importer520 Extra Bass 3.5mm In-Ear Stereo Handsfree Stereo Earphones Earbuds with Microphone for Sanyo Mirro 3810 (Boost Mobile, Sprint) - White Brand New Retail Package Spiral Shape looks good A good flexibility and extensibility ensure good durability and tensile strength The cable is esay to arrange and avoids falling into messy trouble in your life. This in-ear earphone provides incredible sound quality with kust a hint of ambient sounds for a richer soundscape Frequency Range: 20Hz~20kHz. Sound Pressure Level: 107dB3dB/100mW. Total Harmonic Distortion: &lt;=5,(Input Power: 10mW; Frequency Range: 20Hz~20kHz)