The Pelican Mini Flasher 2130IR has a flashing infrared LED lamp. This is for use with special night-vision equipment. Just twist to turn the light on. It is powered by 2 L1154 1.2V alkaline coin cells that last around 65 hours before replacing. It is also submersible to 3.3' for 30 minutes.
L1154 Coin Cell Batteries
Heavy-duty Clip and Ring
Pelican Mini Flasher 2130IR Infrared LED Light (Black)