Feather of the wireless charger pad: 1. Input: 5V 2A; 2. Output: 5V 1A; 3. Transmission distance: Vertical 5mm; 4. Item Weight: 125g; 5. Charging efficiency: 73%; 6. Executive Standard: QI wireless charging standard; 7.Color: White + Black; Feature of the wireless charger receiver Input power: WPC 5W; Output: 800mA; Charging current: DC 5V / 500mA (Max.); Charging time: about 5 hrs; Reaction temperature: -10~40 degree; Working heat up range: below 20 degree (ambient temperature below 25 degree); Working ambient humidity: below 80%; Working life: Charge & discharge above 4000 times; Size: Approx. 65 x 54 x 1mm Weight: 5g / 0.17oz How to use it : Step 1: Open the back cover of the Samsung Galaxy S3 / i9300; Step 2: Stick the receiver card to the mobile phone's battery and the two protuberant touch points must touch the two recesses next to the battery; Step 3: Close the back cover; Step 4: Place the mobile phone onto the Qi wireless charging pad.