LED display 59 seconds, add a second Dynamic LED display. Choose a variety of key functions. A: Optional push the system to set hours, the alarm B: press the button set hours, alarm. Have an independent alarm trigger port can be used for power control with a clock radio or music trigger port. An independent BI sound output. Display features a variety of options: 1. Optional 12LED display time. Digital display minutes and seconds. 2. Optional 24LED display time. Digital display minutes and seconds. 3. Optional LED display 59 seconds. Digital display hours, minutes 4. DC power-down power saving function (effectively prevent the battery current consumption is too large loss of power)