We have received the following information from the supplier:

Shaver mode: 62 (dB (A) at 1 pW)
Long hair cutting mode: 64 (dB (A) at 1 pW)

According to online research, the Braun Series 7 has a value of 88 dB. If you trust this value, the Panasonic model is somewhat quieter. However, we have asked whether this value is correct.