The working principle of electric toothbrushes HX5610 and HX5910 is the same, but the colors are different. Random delivery.

Product Features:
New product
Removes up to 2X more plaque
Brushes up to 31,000 times per minute
Improves gum health
Helps to whiten and remove stains on teeth
Smart 2-minute timer

Compatible with Sonicare Essence HX5610/5300/5600 HX5910/5810/5710Series.

Package Includes:
1*HX5610 / HX5910 Handle (Charger and head are not included,bulk package).

NOTE: 
Please note that these handles are brand new without any use but as they came in bulk package, they do not have a retail package . 
Slight scratches or wears may be caused during transit but this is only minor cosmetic issue.  
Their built-in battery are brand new and they are fully functional.