This starter pack combo consists of 1 Unit of Dispenser Machine (One time cost) + 1 Unit of Refill + 2 Units of Batteries. The refill lasts for 90 days and can be purchased again.- 100% Safe for the Elderly, Kids & Pets- 4X Time Less Chemicals- Mosquito Free even with Windows Open 24x7 for 90 Days.- No Pungent Smell
