D&Y Portable Oxygen Spray 5L x 3

I bought this for my Mount Fuji climb this year.
?? Only used one can 3 times (almost full) (2 cans are unused)

Japanese-made portable oxygen spray, convenient for emergencies, 5L.

- Product Name: D&Y Portable Oxygen Spray Made in Japan 5L x 6 cans
- Contents: 5L x 6 cans
- Use: Portable oxygen spray
- Country of Manufacture: Made in Japan
- Brand Name: D&Y

Thank you for looking.