Headphones, Perman HiFi Woofer Speaker Super Bass Stereo In-Ear Earphone Sport Headset with Headphone Storage Bag (Gold ) HiFi Woofer Speaker, Perfect bass. 100% brand new and high quality. High-quality TPE cable,Tension high quality wire, the more pure sound output. Medical silicone Earmuffs,Perfect isolation from outside noise,Long-wearing still comfortable. Impedance: 32. Frequency Response: 20Hz-20KHz. Rated Power: 20mW. Power Capability: 35mW.