Charging / Battery status
Connect the headphones to a computer or USB AC adapter (sold separately) using the supplied dedicated USB cable to charge the battery.
The charging status can be checked from the charging LED on headphones.
|
Charging status |
Color of charging LED |
|
Charging |
 |
|
Fully charged |
 |
When using the headphones for the first time after purchase or when the remaining power of the rechargeable battery is low, charge the battery.
The headphones can be used for approximately 10 hours of music playback when fully charged.
It takes approximately 2 hours to fully charge the rechargeable battery from the state of no remaining battery power.
When the USB cable is connected to this device, the headphones disconnect from Bluetooth and enter charging mode. Reconnect to Bluetooth to start Bluetooth playback again. link
The usable time of the headphones differs depending on the temperature of the environment in which they are used and method of use.
NOTE
When connecting the USB cable to the USB port, be sure to match the cable connector with the shape of the socket. Forcing the connector into the socket will cause damage.
The rating of the charging output should be DC 5 V, 2.4 A or less.
Checking the remaining battery power
The remaining power of the rechargeable battery can be checked from the number of alert sounds or audio guidance. It can also be checked from the number of times the charging LED flashes. Press and hold the 
button for approximately 2 seconds to turn the power on. If a call is not in progress, press and release the button.
|
Number of alert sounds |
Number of times the charging LED flashes |
Remaining time of rechargeable battery |
|
Four times |
Four times |
Approx. 10 hours |
|
Three times |
Three times |
Approx. 5 hours |
|
Twice |
Twice |
Approx. 3 hours |
|
Once |
Once |
Less than 1 hours |
When the remaining power of the rechargeable battery is running low, the charging LED flashes at approximately 3-second intervals together with an alert sound.
You can also check the remaining power of the rechargeable battery on an iPhone. (*)
The remaining power of the rechargeable battery can be displayed as a percentage (%) on an iPhone, but this number is an approximate value.