[WIRELESS TRANSMISSION] Monitors Indoor/Outdoor temperatures (°F/°C) and HI/LO records; INCLUDES weather-resistant sensor with 330 ft range (no obstructions) [PRECISE ATOMIC TIME] Accurate to the second Atomic time will automatically set and readjust to Daylight Saving Time (OFF option) [ALARM WITH SNOOZE] Crescendo time alarm with 10 minute snooze feature; Full Calendar display and Moon phase icons [SIMPLE-SET] Simple adjustable switch to your Time Zone (7 USA time zone settings: Atlantic to Hawaiian); 12 Hour time mode [EASY READ] Large 2.125 inch time digits for simple view; [BATTERY OPERATED] requires 4 AA alkaline batteries (not included) for Clock & Sensor