What are the Feature of  wireless charger?

1.The wireless charge function only support the digital devices which meet the standard of Qi wireless requirement. Suitable for Galaxy S6 S7 S6 Edge, for iPhone 7, for Nokia Lumia 820 920 1020, for HTC 8X, for Huawei W3 and so on
2. If without the wireless receiving function, a wireless receiver is required
3. Wireless charging pad itself can be charged via USB cable or another wireless charging pad (back face down, not included)
4. Intelligent protection against overcharge, overheat and over discharge
 

What are the Specification of desk wireless charger?