Work Temperature 0℃~40℃, Weight anbout 84g, Output Voltage 5.0V~5W MAX/9.0V~10W MAX, Size 96.8*105.8*58.8mm, Input Voltage 5.0V~2A/9.0V~1.6A, Material Plastic+Hardware+Silicon Gel, Color Black, Transmission Distance ≤4mm.
Just check coupons out (with price alert and history). Best price?
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
1. ($16.89): BGCARELEC
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): 502C6B, 70maifast, BgAuMotor, TTxBG10, BGX7MPQ, BGSALEQI, BGAnniversary, AM15prime, BGNDVRs, BGCar1val, BG1111CAR, 0e7f33, FBCOUPON1
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi 70mai QI Car Phone Holder Charger 10W? There we go. The lowest price was: $15.99.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).