You can improve your brushing technique with the Oral-B Genius X Special Edition Black. Choose one of the 6 different brushing modes to adjust the intensity to your preference. For example, choose the gentle brushing mode for sensitive teeth and inflamed gums or the intense brushing mode for whiter teeth. The toothbrush guides you as you brush. The pressure sensor tells you when you're brushing too hard or staying in one spot for too long. You receive feedback about your brushing and tips on how to improve your brushing behavior via the smartphone app. That's useful, as you know for sure that you're cleaning your teeth properly. The battery lasts for about 48 minutes. This is enough for about 12 days of brushing without charging.