The basic package comes with a main unit (which is the barometer, temperature and calendar clock station), and a remote unit (the thermo sensor). The main unit has large read-outs for weather forecast, indoor temperature, calendar clock and temperatures collected and transmitted by the remote unit. The main unit can support up to three remote units. The main unit is capable of keeping track of the maximum and minimum temperature of different sites. And no wire installation is required. As the BAR888A operates at 433MHz, it can be used in the U. and most places in Continental Europe. It automatically synchronizes its current time and date when it is brought within range of the radio signal from U. Atomic Clock. You can also set the calendar clock manually when it is off range. Other features include three-language display, crescendo alarm and interchangeable display modes...