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Power supply: 1x 20700 / 18650 battery, Resistance: 0.2 ohm – 1.2 ohm
Aliexpress
There’re some similar (or not) items on Aliexpress
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Price history and price alert
Check out price history chart (for all/most countries) for Ehpro Armor Prime Mod Black [Fast-23].
Price records source(s): Gearbest
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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)).