Enclosed with this package is one (1) main display unit and one (1) cable-free remote thermo-hygro sensor unit. The main unit has an LCD that shows recordings for indoor and outdoor temperatures, humidity, maximum and minimum recordings. The unit supports up to three 433MHz remote thermo-sensors or thermo-hygro sensors. No wire installation is required between the main and remote units. As the BHGR618 operates at 433MHz, it can be used in the U. and most places in Continental Europe. A RF SIGNAL INDICATOR - Indicates the signal-receiving status of the unit B Upper window - Displays the temperature data C Lower window - Displays the humidity data D [ IN / REMOTE ] - Selects between the main-unit display and a selected remote unit - Activates search mode E [ CHANNEL ] button - Selects among different channels - Activates remote sensor scanning mode F [ MEM / CLEAR ] button - Recalls the maximum or minimum temperature and humidity readings - Clears the maximum and minimum temperature and humidity memory of remote sensor channels or the main unit display FEATURES & KEY CONFIGURATION : MAIN UNIT G [ RESET ] - Returns all settings to default values and erases all memories H [ °C/°F ] slide switch - Selects between degree Centigrade (°C) and Fahrenheit (°F) A B G C D F E H 1 GB GB a d b e c f Note that the effective range is vastly affected by the building materials and where the main and remote units are positioned. Try various set-ups for best result. Though the remote units are weather resistant, they should be placed away from direct sunlight, rain or snow. BATTERY AND CHANNEL INSTALLATION: REMOTE UNIT The remote thermo-hygro sensor unit uses two (2) UM-4 or "AAA" size alkaline batteries...