The Time Tracker™ from Heathrow Scientific is designed like a traffic signal so the meaning of each light is intuitive. Green light means less than half done, yellow means more than half done, and red means finished. Program the Time Tracker™ and select from six different audible alerts. Two-line LCD with 8 mm high characters, 10 characters across. The Time Tracker™ operates on 110 VAC adapter (included). Measures 112 x 118 x 230 mm.