1. Invisible hearing aid sound amplifier. 2. Super mini size and light weight, not easily to be seen. 3. Adjust volume to the minimum before wearing. 4. Increase volume gradually to avoid sudden increase in sound. 5. Convenient for watching movie, enjoying the drama, attending meeting, or having class, it could help you hear the sound clearly and loudly. 6. Power by 2 x A10 Button batteries. 7. Ear universal hearing aid for Left / Right.
