Feature of wireless charger pad 1. Input: 5V 2A 2. Output: 5V 1A 3. Transmission distance: Vertical 5mm 4. Item Weight: 120g 5. Charging efficiency: 73% 6. Executive Standard: QI wireless charging standard 7. Color: White Feature of Wireless Charger Receiver It is specially designed for Samsung Galaxy S5. Ultrathin design compact and light weight without increasing additional weight of the S5. Adding wireless charging feature by piggybacking it on the battery of S5 it works well with any Qi-enabled charger. Easy to use. The receiver can be attached to the battery all the time and it would not interrupt the normal use of the S5. Specifications: Color: White Input power: WPC 5W Output: 750mA Charging current: DC5V/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. 46 * 36 * 0.8mm eight: 3g / 0.17oz How to use it : Step 1: Open the back cover of the Samsung Galaxy S5; 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