What frequency waves does Bluetooth use?

It uses radio waves in the 2.4 to 2.485 GHz frequency band .

Devices connected in a Bluetooth network communicate with each other using ultra-high frequency (UHF) radio waves . These are electromagnetic waves with frequencies around 2.4 gigahertz (2.4 billion waves per second).

The range of the Bluetooth® connection is approximately 30 feet (10 meters ). However, maximum communication range will vary depending on obstacles (person, metal, wall, etc.) or electromagnetic environment. NOTE: Not all audio devices are supplied with Bluetooth capability.23 Tem 2019

Frequency. Bluetooth only does its work on a 2.4GHz frequency, whereas many WiFI networks these days will run on both 2.4GHz and 5GHz frequencies.