It is specially designed for Samsung Galaxy S5. Ultrathin design compact and lightweight 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 the battery all the time and it would not interrupt the normal use of the S5. Specifications: Color: Black 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