In North America, DECT suffers from deficiencies in comparison to DECT elsewhere, since the UPCS band (1920–1930 MHz) is not free from heavy interference.[20] Bandwidth is half as wide as that used in Europe (1880–1900 MHz), the 4 mW average transmission power reduces range compared to the 10 mW permitted in Europe, and the commonplace lack of GAP compatibility among US vendors binds customers to a single vendor.