How to use MOTO S9 is very simple: first turn on the Bluetooth headset and press and hold the power button for about 8 seconds. Wait until the LED indicator light stays blue, then turn on the Bluetooth of the phone and search. When the phone searches for the headset, enter the pairing password 0000 to use it. Because the S9 is defined as a sports Bluetooth stereo headset, it is easy to sweat during exercise. Therefore, the materials of the earphones are mainly hard plastic (the bracket of the outer earphones) and soft rubber (the red part inside). It has a strong glue feel when held in hand. The S9 adopts a streamlined rear-mounted design and is relatively lightweight. This design helps prevent it from falling easily during exercise. However, this design will cause some discomfort when you first use it, especially if you wear it for too long, your ear bones will feel painful. Therefore, it is recommended that you take it off after wearing it for a while to relax your ear bones. There are corresponding buttons on the left and right sides of the headset. If your phone supports AVRCP, you can use these buttons to forward, rewind, pause/resume, and adjust the volume of the song. On the left earphone are the volume control keys and the answer button. You can see that the answer button is obviously prominent. On the right earphone are forward, backward and pause. The volume keys and forward and backward keys are all touch-sensitive. During use, the corresponding operations will be performed with just a slight touch. But the answer button and pause button are not, and you need to use a little more force during operation. Many people on the Internet will say that S9 can only listen to music but cannot make calls. This is wrong, the S9's MIC is on the left earphone. Only the left earphone can be used during calls, and both earphones cannot be used to answer or make calls. This design can only be said to be a pity, and it cannot make the best use of it. Behind the headphones is the power switch and USB charging interface. Open the soft rubber part of the USB logo and you will see the USB interface. It is very convenient to use the USB interface. As long as you have a standard miniUSB cable, you can connect it to the computer for charging. Generally, it can be fully charged in about 2 hours. The headset LED (just below the power supply and USB interface) indicator light will show red when charging, green when fully charged, and blue when Bluetooth is in use