The world famous Lil Whizz Kit is a non-refillable one time use, disposable 3 oz belt. It comes with everything you need right out of the box. The premixed synthetic human urine reacts and feels like real urine when used as directed. You cannot contract any infectious diseases from this product and is chemically similar to real urine. The synthetic urine stays good for one year. It can be used as a one-time-use Female Whizzinator.