You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
Standby time: Up to 380hrs, – Bluetooth version: V4.1
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):
Price history and price alert
Here is price history (for all/most countries) for Siroflo X13 Bluetooth Sport Earphones.
Price records source(s): Gearbest
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)).