This product is a professional hearing aid. Using it can help you rediscovering the pleasure of listening to nature's sounds or talking to others. Different from the hearing aid that is ear-hook shape, this product can be fixed in your pocket, which is more convenient to control the voice volume. Why not have a look now?Material: Acrylonitrile Butadiene StyreneMaximal Sound Output: 129dB ± 4dBMaximal Sound Gain: ? 55dB ± 5dBHarmonic Wave Distortion: ? 5%Frequency Range: 450-3500 HzInput Noise: ? 30dBBattery: 1 * 1.5V AA Alkaline Battery (NOT Included)Working Voltage: Direct Current 1.5VWorking Current: ? 4mAItem Size: Approx. 4.5 * 2.5 * 7.0cm / 2.0 * 1.0 * 2.8in (L * W * H)Item Weight: Approx. 28.0g / 1.0ozTotal Size: Approx. 12.1 * 8.6 * 3.2cm / 4.8 * 3.4 * 1.3in (L * W * H)Total Weight: Approx. 111.0g / 3.9ozNote: This product does not contain batteriesNotes:1. Please read the user manual before using.2. To protect your hearing, please don't use this product at a high volume for a long time.
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