4 Port 2.1 Amp USB Wall Charger Charge up to 4 devices with this compact 4 Port 2.1 Amp USB Wall Charger. Product Dimensions: 3 x 3.2 x 1.5 inches; 4 ounces Input:100V-240V AC. 50/60Hz, 300MA Output:5.0V==2.1A(FOR USBx4) Off-load: &lt; 0.5W