ION Helios Guide D'utilisation Rapide page 4

Charging Helios
If the LEDs appear dim, or if your music cuts out or fails to play, your
battery may require recharging.
Use the included micro-USB cable to connect Helios to (A) a USB power
adapter connected to a power outlet (not included), or (B) your computer
(powered on) for 5.5 hours.
(A)
(B)
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