The innovative device is offered in modern decorative design and has a variety of features and functions to meet your needs. Power On/Off Switch Green LED: flashing every 5S shows the dispenser is operating The device includes a timer to set activation periods- 3 interval settings(7.5, 15&30 minutes) 24 hour/night/day- a light/darkness sensor for the optimal economy. Red light signals for empty can Alkaline C Batteries: Batteries last for approximately 4 – 8 months, depending on the device’s timing.