MaxSound Output: 130±5 dB

MaxSound Gain: 55±5 dB

Harmonic Wave Distortion:≤10％(1000Hz)

FrequencyRange: 300-4500 Hz

Input Noise:≤30 dB

Battery: AG13 Button batteries (included 1pcs ,due to post mail donot allow ship too more battery ,we will ship 1pcs battery for your reference.)

Working Voltage: dc1.5V

Working Current:≤3mA

Color: As the picture shows

Item Size: 3.8 x 2.1 x 0.9 x 3cm

Package Size:  19 x 8.2 x 2cm

Net Weight: 9g

Package Weight: 66g

Package Dimensions: 17,7cm x 8,5 x 1,8 (L x W x H)

Package Includes:

1 x Hearing aid
3 x Earplug (different sizes)
1 x User manual