T Tocas Large Big Number LED Snooze Wall Desk Alarm Clock Thermometer Calendar (White) Function:Led Clock,Thermometer,Calendar,Alarm,Luminous,Snooze Long-distance readable. it is readable easily within 25 meters, which is very different from traditional clocks Power Supply is input 100-240v,Working voltage:7.5v the LED brightness can be adjusted It can be used as a table/desk clock, but also can be hung to act as a wall clock.