The automatic model is sensor controlled and has a lid which quickly opens when the trash bag gets about 10 inches and 130 degree angles from the can's sensor. With normal usage, the power will last about 6 months with 4 D-size batteries. For those that do not require trash bags, the inner bucket can be easily removed and cleaned when the trash is removed and taken out.
Mint Extract: If you favor neither the smell of citrus nor vanilla, you can perhaps use mint extract instead. Pour several drops of mint extract on a couple of cotton wools. Toss the cotton wools inside the confined space and leave them for a couple of days.