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Without cables The Wireless Mystic makes it easier than ever to bring the weather story into your home. This wireless version of our popular Mystic instrument operates at a powerful 900mhz which allows for up to 300' transmission distance in typical residential installations. When outdoor temperatures change, Mystic receives updates every 2 seconds. The wireless temperature transmitter operates for up to 18 months on 2 AA batteries (included). Mystic provides a digital display of both barometer pressure and temperature in four different modes: Present, High, Low, and Rate of Change for barometric pressure, which shows the amount of change in inches per hour. When connected to a Wireless Merlin, the Wind Chill setting will show the effect of wind speed on temperature. Features user-selectable units of measurement for temperature (C, F) and barometric pressure (inHG, mmHg) Mystic is protected by a 10-year internal backup to handle power outages and preserve data. Includes 900mhz transmitter/temperature sensor, AC adapter (for indicator) and installation hardware. A single 900mhz Wireless Receiver (sold separately) is required to operate this system. Specify altitude if above 3000'.