An adjustable brightness red LED (light emitting diode) illuminator which can be used with Antares, Celestron, Meade and many other brands' guiding eyepieces and Polar finderscopes. Same product as the Celestron Illuminator (item #60011). All metal body with combination On/Off switch. Threaded at one end to fit standard 8mm reticles. Requires two LR44 batteries (included).