They are common charging interface with two 2 5V2.4A super charging port and two 5V1A universal charging port

Addition 4 USB Charger Port Power Smartphones, Tablets, and Electronic Gadgets

•Universal Stand Compatible with Apple iPad, Mini,iPhone 4S, 5, 5C, 5S ,Samsung Galaxy Tab 2, 3, S3, S4 ,Nexus 7, Kindle

•2x 5V 1A Charging Port Enabled and 2x 5V 2.4A Super Charging Port Charging Any Devices

•Holds your smartphone upright on a desk or countertop while charging and syncing

•Surge Protector inside Bring Reliable Power,Charge Four Devices at 5V 6.8 Amps (34Watt) Max

comes with 3pin plug