We only use chip from the Texas Instruments and Freescale.

We don't use the cheap and un-saft , un approval chip by Qi. So our price is little higher.

wireless charging pad is engineered with the latest high efficiency charging technology. It's fully compatible with WPC's QI standard. This pad offers features: 5-8mm of wireless 

charging distance and over 72% of efficiency. Supporting all QI enabled devices, such as iPhone5, Nokia 9300, N7100, Lumia920, Galaxy Note II, Galaxy 4S, LG Nexus, HTL 8X 

and many more, this wireless charger pad offers great convenience of battery charging.