The hearing aid come with rechargeable function,no need to change battery The hearing aid combines a cosmetically appealing look with the smooth sound an internal speaker This hearing aid channel digital sound processing allows the user to control volume and programs Filter out unwanted noise caused by airflow or wind Deliver direct,powerful,and smooth sound right into your ear Moisture resistant provides durability to most forms of moisture and wear Separate wire and headphone,more convenient and safety The In the Ear Hearing Aids also provide improved technology for reduced electromagnetic interference Hearing Aid Devices are suitable for severe hearing loss people Smaller than a credit card,Affordable Hearing Aids are discreet enough to fit easily in your pocket or handbag Maximum Saturation Sound Pressure:129dB 4dB Maximum File Acoustic Gain:48dB 5dB Harmonic Distortion:less than equal 18%(450 less than equal F less than equal 5000) Frequency Response:450-3000Hz Equivalent Input Noise:less than equal 30dB Battery Type:Li-ion Battery Operating Voltage:0.20.1V Operating Current:less than equal 4mA Size:2.2x1.9x1.4cm Item Type:Ear Care Model Number:K-88 Brand Name: Feature:Hearing Aids Feature 1:Acousticon Feature 2:Hear Clear Feature 3:Rechargeable Hearing Aid Feature 4:Mini Hearing Aid Feature 6:Amplifier Ear Aid Feature 7:In Ear Hearing Aids Plug Type:US Plug,it applies to Canada,India,Japan,Mexico,Thailand,the ,the Philippines and so on. Colour:blue Material:ABS Voltage: AC110V Package Contents: 1* hearing aid 4* earbuds 1* rope 1* charger (with US plug) 1* carrying case 1* box Only the above package content, other products are not included. Note: Light reflection 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.