Features： 1、BACKLIGHT AND DISPLAY: With backlight function, press any button, the green backlight will be turned on. Large LCD digital display is easy to read 2、TIME SETTING: You can view the set target time by pressing the Look key. Automatically calculate the countdown days, the countdown time setting range is 0‑9999 days 23 hours 59 minutes 59 seconds 3、SUPPORT RESET: Long press the clear key to clear the countdown data, very convenient for you to operate 4、BUZZER REMINDER: After countdown, the buzzer will ring continuously for 1 minute. Press any key to close the reminder 5、WIDE APPLICATION: Days countdown timer can be used for on board chronograph stopwatch, race car brush lap timer Specification： Item Type: Days Countdown Timer Shell Material: ABS Display Mode: LCD Batteries: 2 x AAA batteries(not include) Function Introduction: 1. Automatically calculate the countdown days By setting the current time and target time, the countdown time is automatically calculated. Setting range: 0-9999 days, 23 hours, 59 minutes, 59 seconds 2. After the setting is completed, press the Enter key to confirm, and the LCD screen will display the countdown days and time 3. Reset: Long press the clear button, the countdown data will be reset to zero. 4. Reminder: After the countdown is over, the buzzer will sound continuously for 1 minute to remind, press any button to turn off the reminder Application Range: Car chronograph stopwatch racing lap timer Display Size(LxW): Approx. 65 x 35mm / 2.56 x 1.38in Product Size(LxW): Approx. 129 x 64mm / 5.08 x 2.52in Upper Thickness: Approx. 27mm / 1.06in Lower Thickness: Approx. 44mm / 1.73in Package List： 1 x Days Countdown Timer 4 x Accessories 1 x User Manual