The modern dial tone varies between countries. The Precise Tone Plan for the North American Numbering Plan of the US, Canada, and various Caribbean nations specifies a combination of two tones (350 Hz and 440 Hz) which, when mixed, creates a beat frequency of 90 Hz. The UK dial tone is extremely similar, but combines two 350 Hz and 450 Hz tones instead, creating a 100Hz beat frequency. Most of Europe, as well as much of Latin America and Africa, uses a constant single tone of 425 Hz. France uses currently a 440 Hz single tone and the Japan uses a 400 Hz.