LFF Atomic Wall Clock 15" Digital — WWVB Radio-Synced Time, Large 4.5" Numbers, Wireless Outdoor Sensor

The LFF 15" atomic wall clock keeps precise, radio-synced time automatically and also shows indoor/outdoor temperature and humidity with a wireless sensor.

This battery-powered digital clock receives the WWVB atomic time signal from NIST, so you rarely need to touch the time settings. Its large 9.4" high-definition LCD numbers and multi-line layout display time, day, date, alarm status, and both indoor and outdoor temperature and humidity at a glance. The package includes a splash-resistant wireless outdoor sensor and simple controls for 12/24 hour formats and eight U.S. time zones.

How does the atomic synchronization keep my clock accurate?

The LFF clock contains a built-in WWVB radio receiver that periodically syncs with the U.S. National Institute of Standards and Technology signal. When reception is available, the clock updates its seconds, time zone, and calendar automatically so you don’t need to reset after power interruptions. Manual set options exist if radio reception is limited at your location.

• Automatic sync with NIST’s WWVB broadcast
• Selectable 8 U.S. time zones (EST, CST, MST, PST, AKT, HST, AST, NST)
• Manual override for areas with weak radio reception
• Counts seconds for precise timekeeping when signal is received

What measurements does it show and how easy are they to read?

The display combines a large, high-definition LCD with 4.5" digits for the main time, plus dedicated lines for calendar, day of week, alarm, indoor temperature/humidity, and outdoor sensor readings. Contrast and layout prioritize readability for seniors and anyone who prefers bold numerals. You can switch between °F and °C and choose a 12- or 24-hour clock.

• 9.4" tall display area with 4.5" main digits for quick visibility
• Shows date, weekday, alarm indicator, indoor/outdoor temp and humidity
• °F/°C toggle and 12/24 hour format available
• Suitable for wall mounting or desktop placement

How does the wireless outdoor sensor work and what are the limits?

The included sensor transmits temperature and humidity readings to the clock up to about 328 feet (100 meters) in open space. It is splash-resistant (IPX4) but should be mounted in a sheltered position away from direct rain and heat sources for best accuracy. Cold climates below -4°F may require lithium batteries in the sensor for reliable performance.

• Wireless transmission range up to 328 feet (100 meters) line-of-sight
• IPX4 splash-proof rating—best placed under eaves or a porch
• Uses 2 AAA batteries (not included); replace with lithium below -4°F
• Transmits outdoor readings to the main display in real time

What power, mounting and setup should I expect?

The clock runs on 4 AA batteries (not included) while the outdoor sensor needs 2 AAA batteries. Setup is straightforward using dedicated buttons for time zone, format, alarm, and sensor pairing. Three hanging holes and a fold-out bracket let you hang it on a wall or set it on a desk for flexible placement.

• Main unit dimensions: 14.2" x 9.4" x 1.2" — 15" class display
• Powered by 4 AA batteries; sensor uses 2 AAA batteries (both not included)
• Includes one outdoor sensor and a user manual for quick setup
• Three hanging holes plus desktop bracket for versatile placement

Who is this for? The LFF atomic wall clock suits anyone who wants accurate, low-maintenance timekeeping with the convenience of indoor/outdoor climate data. It's a practical choice for kitchens, living rooms, home offices, garages, and care settings where large digits and simple controls benefit older adults, visually challenged users, or busy households that need glanceable information without smartphone apps.