Walkie talkies typically use radio frequencies within the range of 400-470 MHz, which falls under the UHF (Ultra High Frequency) spectrum. These frequencies are commonly used for short-range communication purposes. UHF frequencies are preferred for walkie talkies due to their ability to penetrate obstacles such as buildings and trees more effectively than higher frequencies. However, it's important to note that specific frequency ranges may vary depending on the region and regulations governing radio communication.