Technical Specifications:Bluetooth Version: 5. 0Bluetooth Range: up to 10m/33ftCharging Time: 1.5 hoursUsing Time?30Hrs+Net Weight: 4.9 oz What?s in the Box:1 x COMEXION Bluetooth Headset1 x Type-C Charging Cable 1 x 3.5mm Audio Cable1 x User Manual The following tips may help you achieve a better calling experience:1. Please make sure the microphone headband has been adjusted correctly and close to your mouth.2. Update your Bluetooth Driver to the latest version. (If you use the headphones on your laptop)3. Make sure all other Bluetooth devices around have been turned off4. If it is tested under a noisy environment, please try another quiet room to see if it will be better.5. Please try to make calls directly from your phone without using any conference apps to see if the issue persists. Notice:1. Overvoltage may damage battery so please use 5V Charger Only.2. Please fully charge before the headset not using for a long time.3. Only allows computer which has Bluetooth function. But you can buy a USB dongle if you have no Bluetooth function.4. Poor sound quality and Bluetooth connection occur sometimes when hardware and Bluetooth Driver are not updated to the latest version (laptops with some bands ).If it still can not work, please kindly contact our support at any time 5. The headset is not compatible with PS4 and XBOX.6.The mute button can only used on cellphone, if you want to mute on Skype or other calling software on PC, please set it through software. 7.Use of Type-C to 3.5 audio cable: insert the special Type-C to 3.5 audio cable, one end of the Type-C head is inserted into the M100 charging port, and the other end of the 3.5 audio head is inserted into the mobile phone or computer audio port to listen to music