Pulsar PL77516 Telos XL50 Thermal Monocular Black Rubber Armor 2.5-20x50mm, 1024x768, 50Hz Resolution Zoom Digital 8xTelos thermal imaging monoculars are designed for use both at night time and during the day and provide exceptional image quality even in adverse weather conditions (fog, smog, rain) and beyond obstacles like branches, tall grass, dense foliage, etc. known to hinder target detection. Unlike night vision devices based on electron optical converters, thermal imaging devices do not need an external light source and are resistant to bright light. Telos