[Easy to understand] The colored disk of this visual timer disappear as time passes. It is super easy to understand for young kids and help people develop a of time [Easy to use] By turning the center knob to expected time duration, the 60-minute timer starts counting down [Silently work] visual timer not make any ticking noise when it is working. 3 alert volumes optional: mute, weak, loud; lasting alarm: 3 seconds/ [Suitable for many occasions] It can be used as a study timer for kids, it can also be used as a kitchen timer, a task timer, meeting timer, or exercise timer [More about timer] The indicator light flash to remind of low power of batteries. 2xAAA batteries required but not included. Power Suplly:2xAAA batteries(Not included batteries) Colour:Blue Material:ABS Size:About 7.8x7.5x4.5cm Package Contents: 1 x Visual Timer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.