iSound 4 Port USB AC Adapter (ISOUND-6767) 1A (max): This port can charge most USB powered devices, including smartphones, up to 1 Amp; it is specially coded to optimally charge non-Apple devices 1A: These 2 ports can charge most USB powered devices, including smartphones, up to 1 Amp; they are specially coded to optimally charge Apple devices 2.4A: This port can charge most USB powered devices, including tablets and smartphones, up to 2.4 Amp for full speed charging