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Built-in: 500 games, Screen: 3 inches, Language: English and Chinese, Battery: 600MA lithium ion rechargeable battery, Speaker: Yes, Working hours: 6 hours
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 Retro Mini Handheld Video Game Console.
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)).