Chihai 9.6-Inch Big Digital Led Display Board Countdown Function Snooze Alarm Clock(green) Real big 9.6-inch LED display board with 3-inch tall digits is easy to read. Make sure you can see the time exactly from distance 3-level brightness control(high-mid-low). Don't disturb your sleep at night 12/24 hour mode("P" light will light up in 24 hour mode). Run by AC power. Default display time, switch to show date or temperature. Cycle display mode(time-temperature-date) or fixed display. Sound countdown mode. Support the max 99 days countdown.The size of clock: 9.25 inches (L)3.26 inches (H)2.12 inches (W). The clock has protection mechanisms, if you can't turn it on, please cut off the power and take out the CR2032 battery and press the "Reset" key for 5 seconds to activate