HVAC Scenting System the AA batteries should be

the AA batteries should be changed every time you replace the HVAC Scent Refill

Please remember: For the DA Mini Dispenser

it will last approximately 93 days

This Mini HVAC Scent Refill has approx

HVAC Scenting System the AA batteries should beOur unique HVAC Scenting System works with your central HVAC system (central Air conditioning and heating). HOW TO INSTALL IT The HVAC Scent Refills have approximately 2,400 sprays, to cover up to 3000 sqft. Manually program frequency and intensity with the remote control. Scents your entire home evenly (*Note: As long as your home's ventilation system is evenly distributed). Crafted with the highest quality essential oils and perfumes. Simple to use.