Axon Rechargeable ITE Hearing Aid Sound Amplifier, Support Volume Control (K-88) Features: 1. The hearing aid come with rechargeable function, no need to change battery 2. The hearing aid combines a cosmetically appealing look with the smooth sound an internal speaker 3. This hearing aid channel digital sound processing allows the user to control volume and programs 4. Filter out unwanted noise caused by airflow or wind Deliver direct, powerful, and smooth sound right into your ear 5. Moisture resistant provides durability to most forms of moisture and wear 6. Separate wire and headphone, more convenient and safety 7. The In the Ear Hearing Aids also provide improved technology for reduced electromagnetic interference 8. Hearing Aid Devices are suitable for severe hearing loss people 9. Smaller than a credit card, Affordable Hearing Aids are discreet enough to fit easily in your pocket or handbag Specification: 1. Saturation Sound Pressure: 129dB+- 4dB 2. File Acoustic Gain: 48dB +- 5dB 3. Harmonic Distortion: Less than or equal 18%(450 less than or equal F less than or equal 5000) 4. Frequency Response: 450-3000Hz 5. Equivalent Input Noise: Less than or equal 30dB 6. Battery Type: Li-ion Battery 7. Operating Voltage: 0.2+-0.1V 8. Operating Current: Less than or equal 4mA 9. Size: 1.8 x 1.4 x 1.6cm 0.7 x 0.5 x 0.6in(H x L x T)