The Kendrick"s 2009-FFR FireFly heater is designed for the astronomer who requires a dew prevention system. Having lower power requirements than Premier heater line, this heater will extend the life of your battery between charges. Using a different heater technology but operating under the same principle as Premier line of heater, this heater will mildly disperse heat into your optics without compromising the figure of your telescope or camera optics. As well, the FireFly heater will direct their heat into your optics instead of losing it into the atmosphere. The heater is very effective in directing most of the heat into the optics which is important if dew is to be prevented.