Learning Resources Magnetic Time Tracker. This oversized magnetic timer is ideal for a variety of tasks. The light and sound cues enable children to understand the passing of time as they can visualise how much time remains, ideal for reinforcing time management skills. Easy-to-use, simply programme the three colour sections and one sound effect to meet your requirements. Magnetic Time Tracker can time up to 24 hours in one second increments. Features magnetic backing for use on a white board and a stand for tabletop display. Measures 17.5cm H. Requires 4 AA batteries (not included).