Standby Time (h) 140 hours, Amplifier level Class 2 (-6dbm – 4dbm), 3.7V, Frequency Response 50-10KHZ, Microphone Yes, Transmission Distance 10m, Battery Capacity 50mAh, Charging Time (h) about 1 hour, Wired Control Not support, Impedance 16Ω, Bluetooth Version 4.2, Play time about 4 hours, Support agreement HandsethandfreeA2DPAVRCP.
Just check coupons out (with price alert and history). Do you want to know what the best price is?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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. Hmmm… There is no active coupon in Banggood at this moment.
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!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): EARSP11, BGAFF10OFF, BGTT10, bGhOnEy10, 13f142, BGSS10%SW, bgshOOp10, BGELIG0920, BG11SHOP, BG4BW25, BGLOAC1, BGa0b145, BGBuscape01, BG651551, BGBRPL2, BGHOTSHOP15, BG53e9c8, BGAlerabatKL, BGd173b4, BGAudioVideo, BGAUDIO, BG9ba0e8, BG1b5830, BGAudio3, BGAudio9
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Remax RB-T16 TWS Bluetooth Earphones is here. The lowest price was: $9.09.
Price records source(s): 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)).