Digital Sound Amplifiers Rechargeable, Noise Reduction In-Ear Digital for Seniors, Enhances Speech and Audio Personal Sound Amplifiers with Portable Charging Case, Both Ears

Specifications: Amplifier battery: 45 mah Rechargeable case battery: 400 mah Charging time of amplifier: ≤2 hours Amplifier working time :≥45 hours The charging box charges the amplifier for 3~4 times Amplifier weight :3.9g / 0.14oz Charge case weight :34g / 1.19oz Average Output: 106±4dBSPL Maximum Output: ≤115dBSPL Average Gain : 33±5dB Peak Gain : 38±5dB Frequency Range: 500Hz~4000Hz Distortion（THD）500Hz ：0.9% Total Harmonic Distortion（THD）1600Hz ：0.4% Total Harmonic Distortion（THD）800Hz ：0.6% Equivalent Input Noise ≤12dB Rated Working Voltage of Amplifier: 3.7V Package List: 2 × Amplifiers 8 × Silicone Ear Domes 10 × Dust proof Nets 1 × Charging Case 1 × Operation Guide 1 × Instruction manual 1 × USB Cable 1 × Cleaning Brus