Ray-JrMALL White in/Outdoor Humidity LCD Digital Indoor Thermometer Hygrometer Gauge Clock 1, you can switch the display press of time (two hours between the dots will flash) and set the alarm time (two dots without flashing), the initial 12-hour period for the AM12: 00, the initial date of January 1st. 2, the time display mode, press and hold 2 seconds to enter time setting, set the minutes, hours, 12/24-hour mode, month and day. During the flashing digital time, press "ADJ" to select and adjust, to complete a set, then press the "MODE" button to click, it will automatically proceed to the next set. 3, alarm time (ALM) display mode, press and hold 2 seconds to enter the alarm time setting, mode of operation and the same time setting.