Sony WF-SP900 Help Manual page 23

Connecting the charging case to a computer
The player and the charging case will charge. The charging lamp (
The lamps ( , ) light up while the player is charging. The charging lamp (
after the charging is complete.
Charging times (USB-based charging)
The full charging time for each is as follows.
The player: about 2.5 hours
The charging case: about 3.5 hours
Charging the player when you are outside
The charging case has a rechargeable battery. If you charge the charging case in advance, you can charge the player
using the charging case in places where there is no power supply.
Check the remaining battery level of the charging case by storing the player inside the charging case or removing it from
the charging case. Charge the charging case before you go outside with the player if the charging lamp (
( , ) are in the following states.
The charging lamp (
The lamp ( ) does not light up within 5 seconds after you store the player inside the charging case. (The battery of
the charging case is depleted.)
The lamp ( ) turns off about 10 seconds after you store the player inside the charging case. (The battery of the
charging case is depleted.)
When you need to charge the player
The lamps ( , ) flash slowly (Battery level: Low). (*1)
The lamps ( , ) flash quickly, and then the player turns off (Battery level: Empty).
You hear the following voice guidance: Battery level low. (*1)
You hear the following voice guidance, and the player turns off: Battery level empty. Please recharge Headset. Power
Off.
) flashes slowly. (The battery level of the charging case is low.)
) lights up while the charging case is charging.
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) and the lamps ( , ) turn off
) or the lamps