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By certification 
Handmade rope earphone with mic for 3.5mm plug iphone and android devices
Thread wrapped earbuds valentines gifts
Bracelet earbuds with magnet closure can be put on hand
Transducer: 14.1mm6U speaker
Impedance: 32Ω±15％
Sensitivty: 100±6dB at 1KHz
Frequency respond: 20Hz-20KHz
Rated Input Power: 5mW
Maximum Input Power: 10mW
TPE cord: 120CM; Jack: φ3.5 Plug
http://www.urizons.com/
