Xiaomi Oclean W1 Oral Irrigator Water Flosser (Banggood, Aliexpress: Charging Time: 2 hours, Battery Capacity(mAh): 1200mAh, 2 times per day）, 2 minutes each time, Pump Water Frequency: about 3 times /2s (standard mode); about 2 times/s (soft mode), Cleaning Mode: standard, Water Tank Capacity: 30ml, gentle, Charging: USB port / 5V1A, Cylinder Capacity: 3.0ml, support Oclean APP automatic cleaning scheme, Working Tme: 15 days (working time is calculated based on default mode, Bluetooth: BT4.2 and above, massage (the best price with coupon)).
Price history, coupons and price alert are available on this page. You probably want to know what is the best price?
Aliexpress
There’re some similar (or not) items 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. There is one great coupon!
Link: Banggood product page
1. ($86.93): BG10OFFAFF1
coupon code has to be applied in shop’s cart 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): BGW1599, BgcLuBofErtA10, BGHBHJ107, BG19561, BG10OFFAFF, BGMAY075, BGwhielabel
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for Xiaomi Oclean W1 Oral Irrigator Water Flosser is here. The lowest price was: $39.99.
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)).