the oral b professional care 9400 is a fantastic product. the difference between brushing with a manual toothbrush and the oral-b is breath taking. it leaves your teeth feeling smooth incredibly clean. the brush has a built in timer which allows you to spend the correct amount of time on each quarter of your mouth with a built in image also showing you when you are brushing too hard, when the toothbrush head needs replacing and when you are done brushing. the built in time also vibrates to let you know when you need to switch sides and when your brushing is complete. it also comes with a charger that you simply place your tooth brush in, with room for additional brush heads if being used by multiple people. the battery life is long, lasting about 5 days before you notice a significant drop in power. it has 3 different brush settings allowing for every last bit of plaque to be removed.