Input Parameter 5V=1A, Dimensions 70.5mm X 161. 5mm X 40mm, Pressure Frequency 1600 Time/Min(0.6mm Dia.), Water Tank 180ML, Battery Type Lithium Battery, Product Net Weight 257.6g (host +1 nozzle), Rated voltage 3.7V, Charging Time 4 Hours, Rated Power 5W.
Get coupons, create price alert or check price history out! What is best price?
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 coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($54.97): BGHB218
2. ($60.79): BG00c906
apply it 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): BGMDr2, BG00000, vipupgrade8, BGDrB2, BG9922, BGHHH2, bgshOOp10, BGHB20, bGhOnEy10, BgoFErTaSchInA10, BGSD58965, BgcLuBofErtA10, BGAFF10OFF, BGCuponation10, BG10OFFAFF, BGwhielabel, 13f142, BG10OFFAFF1, BANGGOODSD, BGHealth06, 00c906, BGHealth10D, 2022ACTIESNL
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for Xiaomi Dr.Bei Oral Irrigator is here. The lowest price was: $27.99.
Price records source(s): Gearbest, 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)).