Description of bluetooth keys
1. Power on key/telephone connect/pause/play button
2. Volume up/next button
3. Volume down/up button
4. The microphones
5. USB charging port
Bluetooth parameter information
Frequency range: 20-20khz
Sensitivity: 95DM
Impedance: 32 ohms
Transmission distance: CLASS Ⅱ
Operating range: 10M
Horn size: 32mm
Charging time: 2H
Duration: 3-6h
Battery: 160-180ma polymer lithium battery
Accessories: data cable + instruction manual
Bluetooth protocol: 4.1
Bluetooth search name: bt-01
size：30*21cm weight：125g
Material: acrylic
Accessories: USB data cable + instruction manual
Bluetooth: 4.1
Product name: bluetooth knit cap
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