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Cable Length (m): 1.2m, Frequency response: 20-20000Hz, Impedance: 32ohms, Sensitivity: 105dB
Aliexpress
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Price history and price alert
Here is price history (for all/most countries) for KSD-A23 Earphones Silver.
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)).