this trash can is super efficient in that it has two compartments for trash/recycle. It does not take up more space since it's all in one. It takes up less space than having two separate trash can. It comes with an AC plug so no need for expensive batteries. It also comes with fresh set of trash bag liners to start with, however any trash bag liner from the store will fit snug and will be hidden when the trash can is closed. The command word is "CAN OPEN", but my wife say's OPEN SAYS ME and it will open from 2 feet away depending on how loud you are. It does have a sensor when you wave your hand over it and it will stay open when you stand their for a long period of time.