Ion-Sonic Rechargeable Toothbrush with Two Brush Heads (Pink)

Does this toothbrush use both sonic and ionic or just one of them?

How to replace the toothbrush? I can not move it from metal post. It sort of frozen.

How often need to charge I’ve been using over a month after initial first charge and it still seems to be working as if fully charged

Do they come in any other colors besides pink and purple?