4 Pack Vacuum Cleaner HEPA Filters for Cyclonic Series RO3753EA RO3731EA RO3786EA 100% new and high quality<br> Super mini size and light weight, not easily to be seen.<br> Convenient for watching movie, enjoying the drama, attending meeting, or having class, it could help you hear the sound clearly and loudly.<br> Specification:<br> Item Type: Ear Care<br> Name:<br> Material: ABS and silicone<br> Mini ITE Hearing aid:<br> Max Sound Output: equal 120 dB<br> Max Sound Gain: equal 30 dB<br> Harmonic Wave Distortion: fless than 1000Hzless than equal 10%,fGreater than 1000Hzless than equal 4%<br> Frequency Range: 250~3800 Hz<br> Input Noise: less than equal 50 dB<br> Battery: 1 x AG3 Button battery (Included)<br> Working Voltage: dc1.5V<br> Working Current: less than equal 4mA<br> Color: skin tone<br> Item Size: 2.2 x 1.9 x 1.5cm<br> Package Size: 9.6 x 8.2 x 3.4cm<br> Quantity: 1 Set<br> Note:<br> Adjust volume to the minimum before wearing.<br> Choose an earplug of slightly bigger size to avoid .<br> Increase volume gradually to avoid sudden increase in sound.<br> If you hear a howling, check the ear (silica gel) is appropriate and whether the size of plug is tight, the appropriate choice of earplugs and plugged, make sure no air leakage.<br> Keep the ear plug clean.<br> Remove the battery if you don't use it for long time.<br> Package Contents:<br> 1 * hearing aid<br> 3 * earplugs<br> 2 * AG3 button batteries<br> 1 * manual<br> 1 * hard box packaging<br> Only the above package content, other products are not included.<br> Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.