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PowerBlock Universal is the space-saving, 3-port wall charger for all tablets, smartphones, e-readers, and wearables. Built-in ChargeSensor technology detects your device's charging requirements and delivers the level of charging power at the rate it needs for fastest, safest charging. PowerBlock works with any standard 100 to 240 volt AC wall outlet and with 3 USB ports in a space-saving configuration and folding outlet blades, PowerBlock 3-port Universal is a luggage-friendly travel companion.