The Rigel Heater helps to eliminate condensation from your Rigel Quik Finder.
0.16 Ampers at 12 Volts
You would also need to have a dew controller or adapter from cigarette lighter socket to phono plug to use it. These accessories can be found here:
Desiccants and Optics Heaters
Image: Rigel Heater installed on a Rigel Quik Finder
A wide range of original Rigel accessories are available from 365astronomy.