Ultimate Ears UE 900S Universal Fit Earphones + FiiO E12A IEM Headphone Amplifier Bundle

Input sensitivity: 101.2 dB @ 1 kHz, 50mW
Frequency response: 20 Hz - 20 kHz
Noise Isolation: -26 decibels of ambient stage noise
Impedance: 30 Ohms @ 1kHz
Internal speaker configuration: 4 proprietary balanced armatures with a 3-way crossover
Input connector: 1/8" headphone jack into any personal monitoring system
Warranty: 1 Year