USB output: USB 5V 1A / 2A / 3A / 4A to work as Power Bank function., Input Current: DC 12V 3A, Output Current: 0.5A ± 30mAx 6 1A ± 50mAx 6 2.0A ± 80mAx 6 4.0A ± 120mAx 2 four current level choices., Fast charge: 4Ax 2 charging., Output Voltage: DC 4.2V / 1.55V, Input Voltage: AC 100 – 240V 50 / 60Hz DC: 12V 3A.
You can create price alert here, copy coupons and view price history. What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($49.08): BGtorch3
2. ($51.97): BGtorch2
paste coupon code in your cart and click Apply 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): linepayflt, EYBG, eybg, BGTORCH, 502C6B, BGBFCR41, FBGEF, bGhOnEy10, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGFLS15, 4BLF, BGAFF10OFF, BGCuponation10, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD, 6GSGIT, BGTorch4, 00c906
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Eizfan X6 Battery Charger. The lowest price was: $35.
Price records source(s): Gearbest, 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)).