Pulsar PL77402 Helion 2 XP50 Thermal Monocular Black 2.5-20x 50mm 640x480 Resolution Pulsar's Helion 2 thermal imaging scope is based on an IR sensor and designed for the use both in the night-time and during the day in adverse weather conditions to see through obstacles hindering detection of targets. It is designed for various areas of application including night hunting, observation, trail orienteering, rescue operations etc.