Received these coupon code from GearBest for this in-ear earphones. KZ ZS3 has detachable cable design that you find in some expensive IEMs, and it can be swapped out to a bluetooth module to make the earphones wireless. It has been nominated as one of the best earphones under $50 by the OzBargain community.
Note that you cannot stack coupon codes on GearBest so you'll have to make that into 2 separate transactions.
Edit: I just realised that the code might have been prepared by GearBest for coolstan but somehow I spotted & posted.
KZ ZS3 Detachable Design HiFi In Ear Stereo Earphones
- USD $5.99 with coupon code coolstan1
- Built-in microphone, both for music and calls
- Detachable design, the cable can be replaced
- Noise canceling function for clear talking
- Super bass delivers the excellent music enjoyment
- Universal 3.5mm plug for most audio devices
KZ Bluetooth Module Upgrade Detachable Cord
- USD $2.99 with coupon code coolstan2
- Bluetooth module adopts plug-in type, which can upgrade the earphone with similar interface to sport Bluetooth headset according to the user's needs
- Bluetooth V4.2, 40nm processed Bluetooth chip, with echo suppression function, can reach noise elimination and voice enhancement in specific environment
- Up to 10m effective transmission distance
- Built-in 60mAh Li-ion battery lasts 175h standby time and 3 - 4h working time
- Charging 1 hour can reach the full state
- On-cord control, handy to adjust volume and switch songs