The TCell™ odour control system dispenses a consistent level of fragrance and up to 3 months of odour control. Conventional gel systems lose their fragrance intensity over the life of the refill, but TCell remains constant. One refill covers up to 169sq metres. When it comes time to change the refill it is quick and simple, taking less than a minute. The battery-free fuel-cell technology contains no propellants or harmful VOCs.