Atomic Clock with Indoor Outdoor Temperature – 8.5» Digital Clock Battery Operated, Self-Setting, 4 Time Zones, DST 𝗔𝗰𝗰𝘂𝗿𝗮𝘁𝗲 𝗔𝘁𝗼𝗺𝗶𝗰 𝗖𝗹𝗼𝗰𝗸 – The atomic clock has a built-in receiver that automatically synchronizes itself with the WWVB radio broadcast, which will update time automatically every midnight to ensure accurate time. It has 4 time zones: EST, CST, MST, PST.𝗔𝘁𝗼𝗺𝗶𝗰 𝗖𝗹𝗼𝗰𝗸 𝘄𝗶𝘁𝗵 𝗜𝗻𝗱𝗼𝗼𝗿 𝗮𝗻𝗱 𝗢𝘂𝘁𝗱𝗼𝗼𝗿 𝗧𝗲𝗺𝗽𝗲𝗿𝗮𝘁𝘂𝗿𝗲 – This atomic clock can display both indoor and outdoor temperature, helps you better manage your daily life. The wireless outdoor sensor monitors and transmits the outdoor temperature to the clock to display. The sensor should be placed within 330 feet and out of direct sunlight or rain.𝗗𝗶𝗴𝗶𝘁𝗮𝗹 𝗖𝗹𝗼𝗰𝗸 𝗕𝗮𝘁𝘁𝗲𝗿𝘆 𝗢𝗽𝗲𝗿𝗮𝘁𝗲𝗱 (𝗡𝗼 𝗕𝗮𝗰𝗸𝗹𝗶𝗴𝗵𝘁) – Both the digital clock and outdoor sensor are supported by non-rechargeable batteries: 3xAAA for clock and 2xAA for outdoor sensor. (Batteries are not included). When batteries of clock or sensor are running low, there would be a low battery symbol appearing on screen and blinking, reminding you to replace new batteries in time.𝗗𝗶𝗴𝗶𝘁𝗮𝗹 𝗔𝗹𝗮𝗿𝗺 𝗖𝗹𝗼𝗰𝗸 𝘄𝗶𝘁𝗵 𝗔𝗨𝗧𝗢 𝗗𝗦𝗧 – When alarm or DST is set on, there would be a corresponding icon staying on screen. Both of them could be turned off manually if for no need. With DST on, clock will go forward or fall back one hour automatically in daylight saving time.𝗟𝗮𝗿𝗴𝗲 𝗗𝗶𝘀𝗽𝗹𝗮𝘆 𝘄𝗶𝘁𝗵 𝗧𝗲𝗺𝗽𝗲𝗿𝗮𝘁𝘂𝗿𝗲, 𝗗𝗮𝘆 𝗮𝗻𝗱 𝗗𝗮𝘁𝗲 – The clock shows time with seconds in big bold in the middle of screen, help you read the time easily and quickly. It also displays indoor temp/outdoor temp/day/date on bottom, provides a full information you need on clock.𝟭𝟮/𝟮𝟰𝗛𝗿 𝗧𝗶𝗺𝗲 𝗠𝗼𝗱𝗲 𝗮𝗻𝗱 𝗙𝗮𝗵𝗿𝗲𝗻𝗵𝗲𝗶𝘁/𝗗𝗲𝗴𝗿𝗲𝗲 𝗦𝘄𝗶𝘁𝗰𝗵𝗮𝗯𝗹𝗲 – This atomic clock has two display modes (standard time and military time). When clock time is set for one mode, the alarm time would be followed same automatically. Also, the temperature display could be exchanged from Fahrenheit to Degree by clicking the button on back.Outdoor temperature range: -40℉ ~ 158℉ (-40°C to 70°C). Indoor temperature range: 32℉ ~ 122℉ (0°C to 50°C). The outdoor sensor should be placed within 300ft/100m and out of direct sun light or rain.