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Ko-Star KTW-20 (K20) TWS Bluetooth Earphone Review

Updated: Aug 3, 2020

The Ko-star KTW-20 (also known as K20) Bluetooth Earphone could be widely used on various devices and daily activities. The ergonomic design ensures that the earphones sits comfortably on your ear while you are working on your job, commuting and jogging. Whether you are an iPhone or Android user, the K20 will work equally well.

Key Highlights

Bluetooth 5.0

The Bluetooth 5.0 technology offers faster pairing with another device, lower power consumption and quicker transmission of sound.

Automatic Pairing

After your first pairing of the earphones, the earphones will be automatically connected to your phone once it is taken out of the charging case. Make sure your bluetooth is turned on before that!


The portable charging case comes with a 500mAh battery and each earphone with a 45mAh Li-ion battery. The publicity poster indicated that the working time for each use will be up to 3 hours, and extra 15 hours with charging case. That's 18 hours in total.

Go ahead and conveniently recharge the earphones anytime and anywhere. Don't forget the charge the charging case though! Batteries in the charging case can be recharged with a Micro USB cable.

Magnetic Case

The slots for the earbuds in the portable charging case will securely contain the earbuds with magnets. Not to worry, your earbuds will not drop out of the case even if you flip it around. The magnets are strong enough to keep the earbuds in place, but they ain't that strong, so you do not have to worry about having a hard time removing the earbuds as well.


The earphones comes with an IPX5 waterproof rating, which is resistant to water sprays from low pressure jets. The earphones will be fine as long as you do not soak them into water.

Built-in Microphone

Whether you are a gamer sitting in front of your computer, driving a vehicle, or doing your routine jogging, the built-in microphone enables you to pick up the phone with the press of the button and speak as though you are talking to yourself.


The pocket sized overall K20 dimensions are about 7.9cm in length, 4cm in breath, 3.8cm in height, and weigh about 50 grams.

Note: Please allow measurements error of 1 to 3mm due to manual measurements.

Supported Bluetooth Profiles


Touch Control Functions

Our Test

Audio Performance

We were impressed by the deep bass on the K20 wireless earphones and clear stereo effects, rendering a more enjoyable experience.

Battery P