The collection includes microphones recordings from 32 mobile phones stimulated by different tones (1 K,2K,5,10K frequency tone). The recording is in PCM format at 44.1 KHz. No SIM was inserted in the mobile phone and no personal data was recorded. The recording took plance in a laboratory. The data set is composed by 900 repetitions of the recording. The data set is useful for studies on multi-factor authentication of mobile phones and fight against distribution of counterfeir electronic products. No SIM was inserted in the mobile phone and no personal data was recorded.
