Celio Qi Wireless Charger Charging Pad+Receiver Kit for Samsung Galaxy S3 (Black) 1. Charging type: battery (one-to-one charging ) 2. Charging frequency: 100-200KHz 3. Power distance: 5mm 4. Dimension: Diameter: 65mmMin-height: 25mmMax-hight: 60mm 5. Electric energy transition: 72% / Input: 5V-2A (Please make sure the input electricity greater than 1.5A)