... of over 5,000 hours(Please ensure adequate power situation).* Press-button-operating Switch.* Perfect for teachers, students, engineers, doctors, ... handy torch, office/school presentation, etc.* Just push the button, and then you can see striking red beam of ... 4 Miles* Light Style: Beam Light* Power Supply: 3X Button Cells* Switch: Button* Output Wave: Continuous Wave* Body Material: Metal* Dimension ...