This pocket hearing aid voice amplifier can filter out ambient noise to provide good sound quality, help people to hear the sound clearly and loudly. It is convenient for watching movie, enjoying the drama, attending meeting, or having class.Features:1. Can filter out ambient noise to provide good sound quality, help people to hear the sound clearly and loudly.2. Designed with a clip on the back, can attach to belt easily.3. Silicone earplugs with different sizes, fit most ears.4. User-friendly design, easy and convenient to operate.5. Portable and light weight, easy to carry with you.6. Durable and reliable, provide a long time use.Specification:Item Type: Pocket Hearing AidMaterial: MetalItem Color: As Pictures ShownMax sound output: 129 4 dBMax sound gain: 58dB 5dBHarmonic distortion: f< 1000Hz 15%, f > 1000Hz 10%Frequency range: 450~3500hzInput noise: 30dBBattery: 1 * AA Battery (Not Included)Working Voltage: DC 1.5VWorking Current: 4mAItem Size: Approx. 6.1 x 4.1 x 1.6 cm / 2.4 x 1.6 x 0.6 inchPackage Weight: Approx. 192 g / 6.8 ozPackage Include: 1 * Hearing Aid4 * Earplugs (Different Size)1 * ManualNote:1. Adjust volume to the minimum before wearing. Increase volume gradually to avoid sudden increase in sound.2. Keep the ear plug clean. Remove the battery if you don't use it for long time.3. Please allow 1-2 cm error due to manual measurement. Please make sure you do not mind before you bid.