Waterproof level IPX6, Battery capacity 300mAh, Rated voltage 3.7V, Product size 183.6x 30x 22.3mm, Material Plastic + Metal, Cleaning mode 3(Soft / Normal / Strong), Rated current 200mA, Motor noise ≤60dB, Color Black, Charging voltage 5V, Standby current ≤20uA.
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Aliexpress
There’re some similar (or not) items on Aliexpress
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Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($14.44): BG75597c
2. ($15.97): BG00c906
you should apply the coupon in your 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): BGORIR305, BGORALIRI1, BGCuponation10, BGHU2602, 13f142, BGHONEY2110, BGHSADFA, BGMAR2604, BGJUY261, BG10OFFAFF1, BGNDH30, BGOCXP81, BGNOXP21, 2022ACTIESNL, BGHB218, BGXPMA36, tRaDetRaCKeR, BGHECARE1, BG612455, BG4ee866
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for Showsee Electric Dental Plaque Calculus Remover? There we go. The lowest price was: $9.99.
Price records source(s): 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)).