Timer-7 is count down or up timer for any purposes: busyness, cooking, learning, working, etc. Completed timer can play a wave sound or run a program with custom parameters. According to left time the program may calculate sum for service, just enter coast of the service, unit of measure (second, minute, hour) and value of the unit. For example $10 for 30 minutes. Features of Pro version: unlimited number of running timers; chain timers (a completed timer can runs next or top timer; for example first timer is lesson and second timer is a break); save and load timers list.