Check The Battery Level - Philips SE571 Quick Start Manual

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Check the battery level

When the handset is off the base station/charger, the
bars indicate the battery level (full, medium and low).
When the handset is on the base station/charger, the
bars keep scrolling until charging completes.
The empty battery icon flashes and you hear an alert
tone.
The battery is low and needs recharging.