Bluetooth headset offers a Personal Sound Amplification Mode for enhanced hearing during wireless cell phone conversations. You can also Bluetooth connect to your cell phone, or switch to local conversation mode, with the touch of your finger or switch automatically. Aura EQ Headset features eight-frequency band equalizer, three preset EQ settings for the most common loss points and an adjustable mode. In addition to the fixed amplifier built into the chip, the headset has an external amplifierto increase the volume when needed with up to 25 percent more volume. Design also includes three microphones: one for Bluetooth conversations on your cell phone, one for local amplified local conversations with it focused in front of you, and one for the ambient noise filtering for crisp, clear sound. A rechargeable Li-Ion battery (sold separately) recharges in less than two hours from USB. The Aura EQ is intended only for mild hearing loss augmentation as defined under FDA rules as a PSAP.