Spent 20 minutes cleaning the metal shavings out of the inside, loaded it with nitro tabs, screwed on the cap, hung it on my key chain.  Simple....until I open it...that was when the chain ring broke off the cap.  This left me with a very small pill "bullet" which was not what I wanted.  It so cheap in price, it wasn't worth sending it back.  Save your time and find a better product.  I have no complaint with the vendor, just a cheap product.