Can I use third-party charging cables or chargers with my Bose QuietComfort Ultra Earbuds?

No, you should only use a power supply or charger recommended or sold by the manufacturer. Using unapproved chargers may result in a risk of fire or injury. Always use an agency-approved power supply that meets local regulatory requirements (such as UL, CSA, VDE, or CCC) as specified on page 3 of the manual.