Compact Washlet Machine
In Japan these days, washlet is becoming a standard function for a toilet. All it is a nice little shower to clean your bottom after you take care of business in the bathroom. By cleaning your bottom with washlet, you can make sure you stay spanking clean while you can eliminate yourself from using excessive amount of toilet paper.
Once you twist the white part (shown on the picture above) all the way to the point until it gets stuck, you can take off the little cap that is covering the hole where the water goes in. You also twist that counter clockwise and put water inside once the cap comes off. Although you could use regular water, it would be much more friendly to your bottom part if you use semi-warm water.