The manual Agility posted above is your best bet, its easier to read than the tiny one provided. A couple of tidbits to share, I have 2 and like them....
- The 180 has been out of production for several years (3-4 at least), so there are no recent changes.
- There is no OFF switch. It turns on when you press the button and turns off after a hour or so if not wet, if you dive, it will stay on for 24 hours.
- Being a one button computer, there are not a who lot of settings normally used other than percent nitrox (if not diving the default air)
- You can set date/time, max PPO, gauge mode, automatic activation, etc... The defaults work well for me.
- Do be aware if you set a nitrox percent and don't use it for a few hours, it will shut off and revert back to air (learned this the hard way)
- There is also a "feature" that will reset to nitrox mix between dives - one I would avoid, I like to set it and leave it unless I change it
- The altitude mode is automatic, if you are over 2000' it will turn on automatically
- The battery indicator will say full or 3/4 full until nearly depleted. So once you loose a couple of bars, replace.