Riin 2 in 1 Cradle Battery Charger Dock + Holder Color Black for Samsung Galaxy (S2  I9100 with 2pcs of battery) Phone dock: Compatible for Samsung i9100 Battery dock: Compatible for Samsung i9100 USB interface: Micro USB, Rated: 5V 1A Dimension: 85 x 85 x 16mm(approx.) Color: Black