Sper Scientific, 810038C, Talking Lab Countdown Timer with CertificationIncludes button cell batteriesA unique and very useful timer featuring a clear pleasant human voice. Eliminate the need to continually visually check time remaining via voice announcements that can be heard from anywhere in the lab. This allows you to concentrate on the experiment you are timing rather than on the timer. In the count-down mode Talking Timer will announce the remaining time every hour. In the final hour it will announce the time remaining every 10 minutes, every minute in the final 10 minutes, and every second in the final 10 seconds. The audible count-down gives you time to return to your experiment and be prepared for the final alarm. A choice of 6 distinctive final alarm sounds makes it easy to identify which Talking Timer has alarmed should you wish to use more than one. Talking Timer is also very useful for work in low light or in the dark where it would be difficult to see a normal timer display. In the CLOCK mode touch any button in the dark and Talking Timer will announce the time. A voice confirms timer and clock settings as you key them in. You also have the option of turning the voice off. Other features include a large 3/4" display with icons to indicate various modes, such as voice off/on, count-down/count-up, etc. Recalls the previous count-down setting for immediate reuse and memorizes another frequently used setting for reuse at any time. Counts up or down to 24 hours. Both functions and the clock work simultaneously. Talking Timer is cleverly designed so that despite its sophisticated features it is very simple and intuitive to use. Has a built in stand for bench top use, clips to a pocket, or sticks to any metal surface with a magnetic back.