Swappable heads with different sizes. First press turns on the light. Lasts a long time on one battery. Kids love treating it as a toy.
The head can come loose if you are constantly changing heads.
Since me and my wife have electric toothbrushes of our own, naturally got one for our girls. Our elder daughter didn’t like it at first, but accepted it when we explained that it helps brush her teeth better. Our toddler loves it more than the banana brush.
Buy a second one instead of having kids share. Constantly changing the heads to different sizes will wear down the notches that secure them.
Turn up the volume if you are using some screen time to distract your kid while brushing their teeth.