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Aliexpress
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Latest coupon and price update (UTC):
Material: DuPont nylon bristle (PP K1011) / 303 SS/ABS HI-121, Battery: lithium battery 3.7V / 800mAh, Vibrational frequency: 31000 times per minute
Price history and price alert
Price history (for all/most countries) for SARMOCARE S100 Electric Toothbrush is here.
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)).