EYEPIECE BOX HEATER... This heater can be placed into an eyepiece or accessory box, observing stool seat or any other place where you would like things kept warm and dry. It can beinstalled permanently or dropped into place as you please. The heater gives off plenty of warmth. It's dimensions are 2.750" (7 cm) x 7" (17.5 cm). the wire leads are 4' long and are left bare. It is a 12 volt, 10 watt heater.