I've got an F11 and get the battery changed at a regular jewelry store just like a regular watch. The battery in the strap is easy to change and I get the replacements at walmart. The F11 will do everything you mentioned except for having a timer.
I am quite happy with mine and find it useful to be able to track the weekly time I have spent in the light cardio, moderate cardio, and hard cardio ranges. The F11 has a facility for you to enter your age, weight and etc so that it can give you a more accurate count on your calorie expenditure.
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