No matter which model you buy, the best wireless headphones all have the same limitation: sooner or later they’ll run out of charge, sending you scurrying for a power point or digging around in your backpack for a battery pack. But the new A6219 GO headphones from Philips have no such problem, because they’re solar powered – and they’ll recharge indoors as well as out.The headphones feature a Powerfoyle solar cell, which it claims can provide up to 80 hours
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