Does it support 220V Voltage?

You would need to either buy a charging base for 220V/240V, OR use a 110V power converter (NOT just a plug shape converter!). See the Oral-B FAQ: https://oralb.com/en-us/faq/can-i-use-my-oral-b-power-toothbrush-internationally-charger-voltage-information (especially the "Are you travelling from the USA to Europe?" section there).

Can you set up multiple users on the app so the whole family could use the brush (using different heads of course)

No, unfortunately it really seems to be designed for a single user. The app only allows one user and while the brush can pair with multiple devices for multiple users it's not implemented well. If you are sharing the brush with another person and you each *always* remember to open the app on your phone before you start brushing, then it will work OK and you'll only see your own data in the app. However, if you brush without opening the app first, then the brush stores the data until it connects to a phone and then downloads all of the data. So if you use it without connecting your phone, then your partner connects their phone the brush will download the data from the time you brushed to their phone.

Does the app show the date, time and length of brushing? Can we use it to monitor our child's brushing habits?

It shows the date of each brushing, but not the exact time. It does show whether the brushing happened in the morning, afternoon, or evening, though, and the number of brushings during each time period of each day. It also shows the length of each brushing, but will not record any brushing of less than 30 seconds. I don't see why you couldn't use this to monitor your child's brushing habits, but keep in mind that the brush will only store data from the last 20 brushings, so you would need to sync with the app every week or so to make sure to capture all of the data. (Assuming your child isn't using the app every time they brush)

Is the battery replaceable ?

Batteries are always replaceable in electronics. The hard part is removing it and reinstalling a new one. These batteries are usually AA or a shorter or fatter version. They are easily found on many battery websites. If you know how to desolder and solder (which any adult can do), then swapping out the batteries will be easy. A soldering kit is $25 or less on Amazon (I recommend one with adjustable temperature or 25 watts or less so you don't fry the circuit board). Batteries with soldering tabs are $2-$4 each (do not buy these on Amazon because they are a ripoff; find an independent battery website). Go on youtube for video instructions.

ASIN	B00O8ODHOA
Age Range (Description)	Adult
Age Range Description	Adult
Best Sellers Rank	#342,982 in Health & Personal Care ( See Top 100 in Health & Personal Care ) #81 in Rotating Electric Toothbrushes
Brand	Oral-B
Bristle Material	Nylon
Colour	White
Country of Origin	USA
Customer Reviews	4.6 out of 5 stars 7,460 Reviews
Handle Material	Plastic
Included Components	Charger, Travel Case
Item Dimensions	19.5 x 9.9 x 25.3 Centimeters
Item Firmness Description	Hard
Item Weight	1 Pounds
Manufacturer	ORAL B
Material Features	Sustainable
Model Name	av2022-Oral-B-oralb pro smartseries power rechargeable electric toothbrush with bluetooth connectivity-04705b52
Mount Motion	Oscillate, Rotate, Pulsate
Number Of Pieces	1
Number of Items	1
Number of settings	5
Operation Mode	Automatic
Other Special Features of the Product	Rechargeable
Package Type Name	Box
Power Source	Battery Powered
Reusability	Reusable
Special Feature	Rechargeable
Target Audience	Unisex-Adults
Toothbrush Head Shape	U-Shaped
UPC	069055125212
Unit Count	1 Count

Oral-B Adult Pro 5000 Smartseries Power Rechargeable Electric Toothbrush With Bluetooth Connectivity And Travel Case, White, Powered By Braun, 1 count

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