Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Frequency response: 20-20000Hz, Sensitivity: 90dB + / – 3dB, Charging hours: 2hours, Workable distance: 10m (barrier-free space), Bluetooth version: V4.0
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 code price check (UTC time):
Price history and price alert
There is only one database record (it was for $15.99), so you can’t see price history chart.
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)).