20 Most Recent Giorgio Armani Armani Leather Collection watch #AR4200 Watch for Men Questions & Answers

Your watch is battery driven. Visit your nearest watch repair shop and ask for new battery.

I hope you didn't get a 'knock-off' through Amazon. This has to be still under warranty, it is a matter of reputation.

If you cannot snap the back on with your fingers the only safe way to get the back on again is to use a watch press. This is an expensive tool that most jewelers will have. I strongly recommend you take it to a jeweler (may want to call first to make sure their company will do it because most chain stores will not work on most brands). They should not charge you.If you are determined to do it yourself then you can try wrapping a wide pliers with duct tape or cloth and applying pressure on the front and back of watch to pop it on. WARNING: this is very dangerous for your watch. DO NOT apply pressure to the crystal, try to put the pressure on the stell lugs instead...