Best Sound Amplifier Adjustable Tone Digital

Item Type: Ear Care is_customized: Yes Brand Name: BRAND NEW Material: ABS Size: PC Model Number: F-883 Saturated Sound Pressure: 110+5 Sound gain: ≥ 30 Harmonic Wave Distortion: ≤ 10% Frequency response Range: 300--- 4000 Hz Input Noise: ≤ 40 Power Voltage: 1.5 V Working Current: ≤4mA Battery Type: AG13 button cell battery (included)