When you watch movie￡? enjoy the drama￡? attend meeting￡? or have classes￡? the product can help you hear the sound clearly and loudly. While in forest￡? if you want to hear very slight sound￡? it will be a good choice. <br> <br> <strong>Features:</strong> <br> Combines with 2 adaptable button batteries￡? easy to install and use. <br> Filter out unwanted noise caused by airflow or wind Deliver direct￡? powerful￡? and smooth sound right into your ear. <br> Mini shape￡? separate wire and headphone￡? more convenient to wear. <br> Provide improved technology for reduced electromagnetic interference. <br> Suitable for severe hearing loss people. <br> Smaller than a credit card￡? discreet enough to fit easily in your pocket or handbag. <br> Presented with portable hygiene carrying case￡? keep your hearing aid sealed and easy to storage and take away. <br> <br> <strong>Specifications:</strong> <br> Max sound Output: 110?à5dB <br> Sound gain: ?Y 30dB <br> Total harmonic wave distortion: ?ü10% <br> Frequency Range: 300-4000Hz <br> Input Noise: ?ü 40dB <br> Voltage: d.c.1.5V <br> Current:?ü4mA <br> Battery Mode: Button Battery <br> Item size: 2 * 1.8 * 1.3cm / 0.8 * 0.7 * 0.5in ( L * W * H ) <br> Item weight: 3g / 0.09oz <br> Package size: 8 * 6.7 * 2.9cm / 3.15 * 2.6 * 1.14in ( L * W * H )? <br> Package weight: 105g / 3.69oz? <br> <br> <strong>Note:</strong> Please read the operation manual carefully before using. <br> <br> <strong>Package List:</strong> <br> 1* Hearing Aid? <br> 1* Operation Manual? <br> 4* Earplugs <br> 1* Carrying Case <br> 2* Button Batteries