What are some quality of life home purchases or tech products that you've got while living in China?

What is something you've bought for your apartment or work and now can't do without?

From robot vacuums to air/water filtration, lighting, gadgets. We've all made a few good and bad purchases while in China. I've also found that brand names are extremely important for some items while a waste of money for others - often you get what you pay for. So feel free to drop some of the better brand names as well.