$8.38 shipped from California (not from China)
Seller has 99.3% positive rating.
Pretty safe to buy from.

Specifications:
Input: DC 5V / 1.5A
Output: 5V / 1A
Frequency: 100 to 200 KHz
Wireless distance: 4-10 mm
Dimension: Ø3.4 x 0.2in
Weights: 1.7oz