Max.OSPL90 :109±2dB

EQ Input Noise : <12dB

Gain :>30 ± 3dB 

Total Harmonic Distor :  <2%

Hearing Aid Bandwidth : 200Hz - 6600HZ

Earbuds Battery Capacity: 50mAh button battery 

Charging Case Battey Capacity: 500mAh 

Earbuds Hearing aid endurance time: about 10 Hours/Charge 

Charing Case:500mAh Battery (About 4 times charge to earbuds) 

Charging Time: Case / 1.5 Hours, Earbuds: : 1 hour