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.
Go down and check coupons out. Remember to check price history if it is available. Do you want to know what the best price is?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
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
coupon code has to be applied in shop’s 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): BGMA1006, BGCuponation10, 13f142, BGHONEY2110, BGAP2606, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD, BGHealth06, 00c906, BGHealth10D, 2022ACTIESNL, BGHB218, 2203ActiesNL, BGHECARE1, BG4ee866
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Do you need price history chart (for all/most countries) for Loskii S4 Electric Toothbrush? There we go. The lowest price was: $15.99.
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)).