The clock itself seems worked relatively robust, but you'd have to screw on the clock if you want to change the battery.
In my view, after this likely in "work" degenerate, since it at least 7 (!) Are tiny little screw that would solve, but what you need even tiny tool. I guess, after about the 2nd or 3rd Battery change either the screw or the corresponding thread in the plastic housing should cease all functions. Aside from being probably the very first change the property "Water-Resistant" should go missing.
Curiously, the clock has been turned "on" with the battery inserted and delivered.
So you have no idea how long the clock is already running and how full or empty the battery. A little tip to the manufacturer: A so-called insulation strips, which the end user could be removed by simply pulling when he takes the first time the clock in operation, would be very helpful. Alternatively, a function with which you can switch the clock or off.
About the situation mentioned in the article description countdown function (which buying decision was for me) does not have the stopwatch!
Anyway, are the more than sparse and very small printed manual here over any information. While the clock is packed with features that are more or less useful for a stopwatch, but the execution or calling of these features is quite complex and cumbersome.
Conclusion:
Those looking for an affordable, the price-performance ratio reasonable stopwatch, can be satisfied with this model perfectly, when one does not make special demands on user-friendliness and durability. Seen in this light, seems the category "Toys" for this stopwatch Amazon to have been yet properly elected. For me, anyway, the clock is not useful and therefore goes back to Amazon.