Increase volume gradually to avoid sudden increase in sound.<br /><br />Features:<br />Pocket design for portability.<br />Anti-shock and anti-drop， user-friendly design.<br />Super mini size and light weight.<br />Reduce noice， provides good sound quality.<br />Durable and reliable for long time use.<br />Silicone earplugs in 4 sizes， fit most ears.<br />Increase volume gradually to avoid sudden increase in sound.<br /><br />Specifications:<br />Max sound output: 110&plusmn;5dB<br />Sound gain: &ge;30dB<br />Total harmonic wave distortion: &le;10%<br />Frequency range: 300-4000Hz<br />Input noise: &le;40dB<br />Voltage: Direct Current 1.5V<br />Current: &le;4mA<br /><br />Package list:<br />1 * Hearing Aid(with one earplug)<br />1 * Carrying Case<br />2 * Button Cell<br />3 * Earplug<br />1 * User Manual<br><img src="//img.tomtop.com/product/xy/2000/2000/p/tt/h/1/h14052-7-0006.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/tt/h/1/h14052-2-0006.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/tt/h/1/h14052-5-0006.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/tt/h/1/h14052-4-0006.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/tt/h/1/h14052-1-0006.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/tt/h/1/h14052-3-0006.jpg" /><br>