Item Type: Bone Conduction Headphone Material: ABS Shell Color: As Picture Shown Weight: Approx. 190.0g/6.7oz Model: PRO9 Bluetooth Version: V5.0 Sound Pressure: 90DB Working Distance: 10M Microphone: -423DB Frequency: 2.402-2.480GHZ Response Frequency: 80-5000 HZ Battery: 3.7V Lithium Battery, 140MAH How to use: 1. After booting, it will automatically enter the pairing state, red and blue flashing alternately, waiting for connection. 2. Turn on the Bluetooth function of the phone and explore Bluetooth devices. Select "Pro9" headset, if you need to enter the pairing number, please enter "0000", repeat the above operation after pairing fails. 3. The blue light flashes slowly after the pairing is successful. Package List 1 x Manual 1 x Tips Card 1 x Bone Conduction Headphone 1 x Charging Cable 1 Pair of Earplug 1. When the connection distance with the device exceeds the effective distance (10m/33ft), the headset may be disconnected from the device. Within 10 minutes thereafter, once they are within the Bluetooth range again, they will automatically reconnect. If the headset is not connected back within 10 minutes, it will automatically shut down.2. If the headset has been connected to the device, when it is turned on again, the Bluetooth headset will automatically connect to the last Bluetooth device. 1Innovative technology does not damage the ears, comfortable to wear, skinfriendly material, lightweight and stressfree. 2360degree stereo sound with heavy bass, bone conduction proofreading sound, stable midrange, super treble, deep bass. 3Adopt bluetooth 5.0 technology, which makes it has widely compatibility, faster and more stable. 4140mah large capacity, strong battery life, IPX6 waterproof, waterproof and sweatproof. 5180 free bending, not afraid of folding, suitable for different sizes of heads, comfortable to wear, not easy to break.