Hippo Wireless Stereo Headphones for Mobile Professionals - Manual (Page 12)

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2(b). If you want to charge the headphones from an electrical outlet, connect the end of the
cable of the Universal Power Adapter to the socket labeled 'DC In’ (refer to Fig 3) on the
headphones. Connect the Universal Power Adapter to an electrical outlet.
The headphones use lithium polymer battery. The headphones are capable of a
continuous playtime of 5 hours. It takes about 2 hours 20 minutes to fully charge the
battery.
Note: It is recommended that you completely charge the headphones before first use.
Fig 5(b)
Universal Power Adapter