OK, So I don't have the watch just yet; it will be in my mailbox by Monday or Tuesday, so to give the benefit of the doubt, I awarded 5 stars, but that could change after I get the watch.

I'm writing this to address some conflicting information in many of the reviews I read here about waterproofing, with some even claiming that despite the 30M rating, the watch took on water when it was dunked into a basin as a test! So I scoured the Traser site. The manual and tech specs on the watch were not very helpful, however, I found the warranty card that had some incredibly useful information about waterproofing on the P5900.

Bottom Line: Will resist moisture from sweat, water splashes and rain - do NOT submerge ; do not swim or dive with it; and do not shower with it (due to heat + moisture)

Here is the source text - hope you will find this helpful..

"Water Resistance (DIN 8310)
The following information will help you to dene which level of water resistance your traser watch has:
* Water-resistance to 30 meters (3 atm)means that this watch will easily withstand
perspiration, splashes of water, rain or even brief contact with water, but it should not
be worn for diving or in any water-sport activities.
* Water-resistance to 100 meters (10 atm)means that your watch is suitable for water-sport activities, such as swimming and snorkeling. It should not be used for scuba diving, high-board diving or sub-aqua diving.
* Water-resistance to 200 meters (20 atm) ) and more means that your watch is suitable for skin diving, snorkeling, scuba diving and high-impact water sports.

Care for Your traser Water-Resistant Watch :
- It is not recommended to wear your water-resistant watch in a hot shower, sauna or hot
tub. The extreme heat causes the metal parts to expand at a different rate than the rubber gaskets. This creates small openings that could allow water droplets to penetrate
the watch. Sudden temperature changes are especially harsh. Take care not to jump into
a cold pool (or snow) after wearing your watch in a hot tub.
- Keep your watch away from heat sources (e.g., radiators, hot water, etc.)."