adjustable condition to fit everyone . advanced outdoor thermometer . humanistic sign on LCD . easy to set (just stick outside the window) . wireless thermometer . environmental protection: low electricity-consuming, no electromagnetic wave . temperature record report . still work under bad surroundings(wind,rain,cold) and UV resistant . automatic calculation for temperature-difference of both sides of the window . be able to predict temperature change . approval for temperature-precision test . approval for water-resistance test . multi-country patent . CE approval