Micro Input: 5V/2.4A; 9V/2A, Battery power: 20000mAh, Brand: Move speed, Total Output: 5V/3A (MAX), USB-A 1 Output: 5V/3A; 9V/2A; 12V/1.5A, Execution standard: GB/T35590-2017, Type-C Output: 5V/3A; 12V/3A; 15V/3A; 20V/2.25A, USB-A 2 Output: 4.5V/5A; 5V/4.5A; 5V/3A; 9V/2A / 12V/1.5A, Type-C input: 5V/3A; 9V/3A; 12V/3A; 15V/3A;20V/1.5A, Model: YSPBK20-45.
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Aliexpress
There’re some similar (or not) items on Aliexpress
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Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I don’t know if this is a good price – number of records in my database is too low! We have found one coupon for this product!
Link: Banggood product page
1. ($52.19): BG04139f
apply code in your basket (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): BG090cd7, BG60a29d, TTBLACK5, BG34b4f9
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Well, you won’t see price history chart, coz we have only 1 database record for this item (and price was $39.99).
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)).