Something you should notice when you buy or use wireless charger
1: Make sure your device supports Qi wireless charging. If not, an extra Qi wireless dongle is required. so please confirm whether your phone need receier or not.
These phones can support wireless charger directly: iPhone 8/8 Plus, iPhone X, Galaxy Note 8, S8/S7/Note 5, LG G2/G3, Galaxy S6, Nexus 6, Moto Droid Turbo, Nexus 5/7(2013)/4, Nokia Lumia 1020/920/928, MOTO Droid Maxx/Droid Mini, HTC Droid DNA, HTC Rzound,Blackberry Z30, and Other Qi-Enabled Phones and Tablets.
2: The range of the optimal charging area varies depending on the size of the receiver coil of your phone. Some phone models have small receiver coils, and can experience sudden interruptions after few seconds of charging. This is because of minor alignment deviations between the transmitter and receiver coil. Please fine tune your phone's position until it gets stable wireless charging, or use a separate Qi receiver with a larger receiver coil.