4 Pack single mode red light flashlight for astronomy, night flights, animals night observation Astronomy activities Red LED flashlight is used for astronomy activities: like stargazing with telescopes, it's perfect for reading charts and making notes at the scope without affecting your night vision. Animals' night observation Animals are not spooked by a red light, It's helpful to find the animals in the dark without disturbing them. Night flight When night flight, red light help light cabin, it prevents the eyes from losing sensitivity to dim light in the darkness. Warming effect Red light has a warming effect on the skin, improving circulation, enhancing cell vitality. Power Source of Red Flashlight Use one 1.5V AA battery,or other rechargeable battery as the AA battery Size but the max Voltage is 4V.Note: Battery is not included in the packageChoose lower voltage battery can help you obtain low-lumen red light and prevent the eyes from losing sensitivity to dim light in the darkness. Four 1-mode red flashlights are included in the package. Note: Battery is not included in the package Zoomable Red Light Pull the head part of the flashlight to zoom in and out the red light. Focused Red Light The Red light beam can be focused and shoot more than 150 yard. Specifications Emitter Type: 3535 Red LEDLight Beam Color: RedMode: One Mode/ Single ModeVoltage: 1.5V-4VBody Material: Aluminum AlloyWeight: 60g/2.1OZSize(Length*Diameter): 3.5"*0.8"/9CM*2CM