When you first turn on the headset, both indicator lights glow.
slow flashing—the headset is discoverable for pairing
quick flashing—the headset is connecting to a mobile phone, or is receiving or making a call
solid—the headset is connected
flashing slowly—the headset and mobile phone are not connected. one of them is not turned on, or the two are more than 10 m (30 feet) apart
While using the headset:
green (solid)—up to 4.5 hours of talk time or 150 hours of standby
yellow (solid)—about 1 hour of talk time or 45 hours of standby
red (slow flashing)—less than 30 minutes of talk time or 22 hours of standby
While charging the headset:
green (solid)—charging is complete
red (solid)—charging error (the room temperature or product may be too warm or too cold)
Most indicator lights turn off in 10 seconds to conserve battery power. Only the red and yellow battery lights flash continuously.
In addition to these indicators, the headset emits tones in response to actions.
four notes (low to high) sound when the headset turns on
four notes (high to low) sound when the headset turns off
three quick notes sound when the headset connects to your mobile phone
low beep (repeats in minutes) indicates the battery is low
one note per press (low to high) indicates volume increase
one note per press (high to low) indicates volume decrease