Max.OSPL90 :109±2dBEQ Input Noise : <12dBGain :>30 ± 3dB Total Harmonic Distor : <2%Hearing Aid Bandwidth : 200Hz - 6600HZEarbuds Battery Capacity: 50mAh button battery Charging Case Battey Capacity: 500mAh Earbuds Hearing aid endurance time: about 10 Hours/Charge Charing Case:500mAh..
