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Model S4, Waterproof grade IP7, Brand Loskii, Output voltage 3.7V, Working mode (Fourth gear) M / N / S / X, Vibration frequency 4000-6000, Charging time 4 hours, Input voltage 5V, Battery capacity 1200mA
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($20.60): BG75597c
2. ($22.06): Cuponation9
3. ($22.30): BG8ReviTrage
4. ($22.79): BG00c906
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGMA1006, BGCuponation10, 13f142, BGHONEY2110, BGAP2606, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD, BGHealth06, 00c906, BGHealth10D, 2022ACTIESNL, BGHB218, 2203ActiesNL, BGHECARE1, 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
Check out price history chart (for all/most countries) for Loskii S4 Electric Toothbrush.
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)).