Shenzhen Chengshi Technology Co. Ltd. M1 Manuel D’Utilisation

Your headset has two lights to indicate the state of charge.  When the red light flashes, you will also 
get a voice prompt in the earphone to tell you to charge the unit. 

1.  Connect the charger to the USB port on the headset 
2.  Connect the charger to an electric power outlet 
3.  The red light will remain constant while the unit is charging 
4.  Once the charging is complete, the red light turns to blue 

Charging takes between 1 and 2 hours and the headset performs best when fully charged 

 
Volume buttons 

 
To prevent possible damage to the ears, pressing the volume + or volume – button increases or 
decreases the earphone volume one step at a time. 

1.  With  the  headset  turned  off,  press  and  hold  the  MFB  key  until  the  red  and  blue  lights  flash 

alternately (takes about 6 seconds).  You will also get a voice message, “Pairing state” in the 
earphone.  This state allows the headset to be paired to another Bluetooth

®

 device. 

2.  Turn on the cell phone and select the Bluetooth

® 

option. 

3.  When the headset model name appears on the cell phone screen, tap to accept.   
4.  If a password is requested, use „0000‟. 
5.  When pairing has been successful, the headset will flash a blue light. 

Note 
 

 

If no connection is established within 2 minutes, the unit will switch off. 

 
Pairing to a second cell phone 
 

1.  Follow the above steps to pair to cell phone #1. 
2.  Turn off the Bluetooth

®

 option on cell phone #1 

3.  Press and hold the MFB key on the headset until the red light flashes and the headset turns off 
4.  Repeat the pairing process as above, but this time using cell phone #2 
5.  Once the second pairing has been successful, turn cell phone #1 on again 
6.  Select the Bluetooth

® 

option, and find and select the headset model number.   

7.  Tap to confirm. 

 

Both cell phones are now paired to the headset. 

 
Notes 



  Pairing will only work properly when earphone and cell phone are within 10 meters of 

each other.  Beyond this distance, sound quality will be reduced or the pairing may not 
operate. 



  Large objects blocking the direct line between units, may cause pairing fail. 



  The  earphone  will  automatically  attempt  to  pair  with  the  cell  phone  following  a 

temporary disconnection.   



  The connection may also be re-established by pressing the MFB key once, or through 

the cell phone‟s Bluetooth

® 

option. 

 
 
 
Connecting your headset to a computer