Go down and check coupons out. Remember to check price history if it is available. Best price?
Battery: 2500mahx5 (12500 mAh), Flow rate: 180L/h, Fast charge: 21V1A (medium 2 feet 220V), Material: PC, silicone and metal, Water pressure: 2.2Mpa, Water pipe length 6 meters
Aliexpress
There’re some similar (or not) items on Aliexpress
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. I’m afraid that there’s no working coupon in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): a0b9f5, BgAuMotor, b71c67, BG0806GR, BGAR18, BGcarwasher, BGauto21, BGDis1024, BGAutos, BGJM0504, BGJIMMYEGM, BGXMJMW, bGhOnEy10, bgshOOp10, BG8965g, BgoFErTaSchInA10, BgcLuBofErtA10, BGJUM16, BG716CN, BGAFF10OFF, BGWA16Z, 00c906
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – JIMMY Handheld Wireless Washing Gun [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for JIMMY Handheld Wireless Washing Gun.
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)).