This is an identification light/safety marker that can be attached to helmets, Velcro backpacks, shoulder bags, etc. It's being released from a backup supply for disaster preparedness/outdoor use. It uses one CR123A or 16340 lithium rechargeable battery. The battery cap is a real type that can be tightened with a screw. - Vertical lever down (visible light) Position 0 = Off, ① = Green constant light, ② = Green constant light + White flashing - Vertical lever up (IR) Position 0 = Off, ① = IR flashing, ② = IR constant light * The performance against the IR light of a smartphone camera is not very good, so it appears dark in the photo. The Velcro on the main body has been applied after degreasing. I cut and applied the extra parts of the Velcro on the battery cap myself. Case and instruction manual are not included. Test battery included (remaining charge is unknown) This is a replica, so please refrain from purchasing if you are nervous or concerned about details. No pets. Non-smoking. Shipped via Yu-Packet Plus. Shipping cost included: 520 yen.