It could be they have multi rated input chargers like some phones and laptops do (I don't have a charger handy to look at the ratings on), but one would still need to use an adaptor to overcome the plug differential if there is one.
It would appear the Philippines have two types of plug.
From the Philippines:
US one on the right.
But the Philippines is 220v where the US is 120v. But if a multi rated input like most chargers nowadays, and the plug type is the same (or an adaptor is available), it will probably be OK. The main unit will be the same anywhere, only the charger plug/range will differ.
One would need to look at the rating plate on the charger. If it specifies a 110-250v, 50-65 hz range of input, it will be OK anywhere subject to a suitable adaptor. If it doesn't, plugging a 120v charger in a 220v supply will make the charger go pop.