Aerielle IAW200-SB i2i AudioWearTM Lanyard-style Earphones One size fits all noise isolation earphones Incredible audio quality Extension cable included to attach to iPods, iPhones, MP3 players, or any audio source with a 3.5mm headphone jack Sensitivity: 100 dB +/- 3dB (at 1KHz, 1mW, 0.12V) Drivers: 9mm