After initial difficulties very well

Furnishings:
Granted, with 3 buttons, the device is something friemelig. The included instructions but at least as understandable, so that this step a few times read succeeded. Yet I must confess that I am still shy define new times, the blood I am not yet passed.

Function:
One can in principle between simple intervals (eg, always 1 minute) or two alternating intervals choose (eg 20 sec and 10 sec). This allows one, for example a simple Tabata training.
Also queried as often or the intervals should be repeated from 0 (infinite) over 1 to 99 everything is adjustable.
Furthermore, you can adjust with which sound (or vibration) you want to be notified at the end of an interval and with which flow this should be done.
In short: The little Gymboss meets all expectations I put on its features.

Processing / use:
The Gymboss externally clothed with a frosted rubber, it fits comfortably in your hand (even in sweaty). The clip on the back has never let me down, even in the wildest movements he considers good.
I must admit, turning off the timer every time I forget (never know which key ...), but that is not a problem 10 minutes after you have stopped the timer, it automatically made when nothing is pressed at this time.
For battery life I can yet say nothing, except that I have not yet had to replace despite regular use.