SoundMagic MP21 Product Features - Compact and portable design - Professional HIFI earphone, has very good noise cancel effect, Achieve -20dB. - Suitable for MP3/MP4, CD, music mobile phone, laptop etc. - Call-answearing button,compatible with iPhone - Comfortable,sound-isolating ear-tips reduce noise. - Make a network call easily by using a swichingcable. - Very balance sound quality with deep bass, smooth mids and well defined highs and the experience is pure high fidelity. - Being an in-ear-design, the MP21 offering unparalleled comfort for long-term listening. - All material under "ROHS" - Come with an audio adapter - Come with carry bag, three pairs of silicon ear pads in S/M/L sizes, sponge ear pads ,cable clip ect. SoundMagic MP21 Specifications Color: White Frequency range: 15Hz-22KHz DC resistance: 12±10% Ω Sensitivity: 97±2dB Sound coupling to the ear: In-ear Cable length: 1.2m (9999.9% copper wire+fibre,TPE coat) Connection: Stereo mini jack plug 3.5 mm Weight(including the packing): 87.0g Microphone Frequency range: 20Hz-16KHz Sensitivity: 58±2dB/mW SoundMagicMp21 is the Shenzhen Soundmagic Technology Development Co., Ltd one of the high quality products , and the same series of products are SoundMagic PL30 , SoundMagic PL50 , SoundMagic PL21 , SoundMagic PL11 etc.