No sound from the right unit

Try the following:

• Bring the headset's left (L) and right (R) units within about 25 cm of each other.
• Set the headset's left (L) and right (R) units in the charging case, and then take them out again.
• Charge the headset's left (L) and right (R) units.
• Turn up the volume on the headset.

  If you are using the headset via a Bluetooth connection, turn up the volume on your smartphone.

• Check whether the sound is playing back correctly on your smartphone.
• Bring the headset's left and right units closer together.

  If the headset's left and right units are separated, sound may only come from the left (L) unit.

• Use a pen, paperclip, or similar object to press the RESTART button on the charging case.
• Hold down buttons (1) and (2) for about 30 seconds until the green indicators flash 2 times (Restarting).
  
• After deleting the device information for the headset from your smartphone, pair them once again.