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