Invisio B3 Mode D'emploi page 5

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Quick Start
Charging the Battery
Connect the AC adapter's mini USB plug to the headset and con-
nect the adapter to a power source. Charge the headset for 8 hours
before first use.
A red light in the TALK button indicates charging. When charged,
the light turns off.
Note: Red blinking light is an indication of low battery. The headset
needs to be charged.