Specifications: Compatible: For Apple Watch Series 1 2 3 4 Business: Charge without cable, working with charging. Portable: Mini body, lightweight and leather belt. Easy to carry. IntellIntelligent: A3 smart chip, smart matching watch model. Main functions: suitable for apple watch charging Emission current: 180ma Neutral packing Operating frequency: 100-200khz Conversion efficiency: greater than 72% Charging mode: magnetic induction charging Model :Apple Watch4 Apple Watch1 Apple Watch Series 3 (GPS+ cellular network) Apple Watch Series 3 (GPS) Apple Watch Series 2 Apple Watch Series 1 Apple Watch Nike+ Series 3 Apple Watch Nike + Apple Watch Edition Apple Watch Edition Series 3 Apple Watch Hermes Series 3 Apple Watch Nike+ Series 3 (GPS) Apple Watch Sport