Feature: Red light against deteriorating eyesightRegular "light shower" counteracts age-related retinal fatigueSuch an LED flashlight with red light of 670 nanometers wavelength can possibly counteract the deterioration of visual performance in old age. Specifications: Product name: Red light flashlightMaterial: Aluminum AlloyColor: BlackWavelength: 665-670nmSize: 96 x 28mm Light Color: one mode red lightsPower by: 3 x AAA battery (not included) Skid-proof design and waterproof design. Package Included: 1x Red Flashlight Note: Please allow 1-3cm difference due to manual measurement.Due to light and screen difference, the item's color may be slightly different from the pictures. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.