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what is the radio frequency that is available for use with any electronic devices without the need for a license?

after researching this is what i found:
40 Mhz - garage door, alarm system
40-50 Mhz - standard cordless phones
49 Mhz - baby monitors
27 & 49 Mhz - basic consumers items

i'm building a project similar to a keys finder.. is it alright if i use 49 Mhz? where could i find any document regarding the use of radio frequencies?


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Hi Keile,
I had a quick look at Google "radio frequency allocation" with the quotes and found this neat chart for the USA that looks like a bookcase until you zoom really close to see its detail. Many frequencies are called FIXED which might include unlicensed for you.

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