Philips Sonicare DiamondClean Rechargeable sonic toothbrush HX9352-04 5 modes 2 brush heads Glass charger travel case Limited Black Edition - Manual (Page 9)

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CHARGING YOUR PHILIPS SONICARE
Charge for 24 hours before first use. The charge indicator flashes green until the
Philips Sonicare is fully charged. Rapid yellow flashing indicates that the battery is low.
Your Philips Sonicare has been designed to last up to 3 weeks on a single charge.
Read ‘Traveling with your Philips Sonicare’ for additional charging methods.
The charging glass is designed to properly charge only one handle at a time.
Do not place metallic objects in the charging glass, as this may affect the charging
process and may cause the charging base to overheat.