... Applications:* Vehicle Rental & Fleet Management etc.* Protect children, the old, the disabled, pets, etc.* Provide peace-of-mind for businessmen ... for fixing the position even at a weak signal status.* Works well even in areas with limited sky view ... : 900/1800/1900MHz (For the countries: Japan, North Korea, the UK, North America, the five states, Canada, the United States, Mexico, Greenland (Denmark ...