... 3. CE, FCC ,RoHS 4. OEM and Factory Price 5. Hot Sales Singingda earphones are designed for sound engineers, musicians, and those ... standard such as iPhone, Blackberry, HTC, Samsung and more.Audio:10 mm handmade driversFrequency Response 20Hz-20kHzImpedance 32ohmSensitivity 103dBMax Input Power ...