3-LED 618nm flashlight , peak wavelength of 618 nanometre ( Red Amber LED )

This LED flashlight features three LEDs with a peak wavelength of 618 nanometre.
The tail cap includes a push button for momentary operation. You can twist the switch to switch to constant on.
This flashlight has only an ON/OFF mode.
The body is made of aluminum, with a length of 145 mm, a head diameter of 26 mm, and a body diameter of 18 mm.
The runtime is approximately 15 hours.This flashlight uses two AA batteries.
The peak wavelength of this LED is 618 nm, but it covers a wavelength range from approximately 570 nm to 660 nm.
Specifically, it starts around 570 nm and gradually increases through 580 nm, 590 nm, 600 nm, 610 nm, and 615 nm,
then decreases through 620 nm, 630 nm, 640 nm, 650 nm, 665 nm.