1. The transmission distance is independent of the Bluetooth version, depending on the Bluetooth technology PowerClass. Most mobile phones and mobile devices use PowerClass2 with a standard transmission distance of 10 meters, while the upgraded PowerClass1 increases the transmission distance to 100 meters.
2. Bluetooth headset radiation is very normal. The general radiation of Bluetooth headset is only between one-tenth and a few thousandth of the mobile phone.
3. The bluetooth headset that makes calls and listens to music is the same type of HFP that mainly focuses on hands-free Bluetooth headsets. It actually has more headset control functions, such as redialing, call retention and rejecting calls. Features. HFP is a Bluetooth headset that emphasizes the function of headphones. HFP Bluetooth headsets are more focused on the functions of headphones, mainly for listening to music.