Premium Manual Inflatable Belt Pack PFD Waist Inflate Life Jacket with Zippered Storage Pocket for Adult Yellow Color

I didn't realize that water would set it off. Totally my fault, but now I'm tasked with putting in a new cartridge and getting it back in the waist bag correctly. The instruction pictures are tiny and a bit hard to reassemble.

Not enough information 1. Only 1 reviewer who says the pfd inflates automatically when you submerge but the description says "manual inflatable". Which is it: automatic or manual, do you have to pull the cord to inflate or will it automatically inflate? Makes a big difference to a swimmer. 2. Some inflatables force you to buy the recharge kit from the manufacturer due to their having a small cheap plastic part that must be installed with the recharge. Otherwise one could buy recharge cylinders for 1/5th the price from Walmart, and even less elsewhere. No detailed information is given showing how the unit is recharged and which pieces, if any, you need to get exclusively from the manufacturer. It just says a CO2 cartridge with a 3/8" thread, same as other brands, but at least they have a video and reviewers who point out that you have to spend alot to recharge the unit. Does this unit need anything beyond a compatible CO2 cartridge to be recharged.