Costar Diamond On T300 True Wireless Earbuds Review
The Costar Diamond On T300 can be a very desirable pick out for those who love to listen to music and play games. It also comes out as a suitable pair of gaming earbuds with enabled low latency sport mode. The energetic noise cancellation and transparency mode work appropriately for the price.

The Diamond On T300 is worth considering if you’re a generic visitor who consumes a lot of media. Further, each ANC and the transparency mode grew to become fantastic for the price. You might want to get your fingers on these earbuds if you play many video games on your cellular smartphone or laptop. The gaming mode on the earbuds significantly reduces latency while gaming. Also, the earbuds provide good mic quality and battery life.
What’s Inside the Box
The box has earbuds, a user manual, and a charging case. It also includes a Type-C cable. There are also six additional ear tips ( 3 pairs) inside the box.


Product Specs
| Colors | Dynamic Black, Smart Grey, Elite White |
| Noise Cancellation Technology | 25dB Active Noise Cancellation |
| Dynamic Bass Boost Driver size | 10mm |
| Frequency | 20Hz-20KHz |
| Bluetooth Version | 5.0 |
| Wireless range | 6-7m |
| Water and Sweat resistant | IPX4 |
| Charging Time | Earbuds: 30 min and Charging case: 1.5 Hrs |
Design
The earbuds and case look stylish and futuristic as it is diamond-shaped. Also, the curves and twin color look amazing on the case and earbuds. There is, of course, a C-Type charging port on the case.
The earbuds are water and sweat-resistant, which makes them perfect for use during a workout.


Costar Diamond On T300 ANC
The Costar Diamond On T300 TWS earbuds come with Active Noise Cancellation (ANC) function that makes them stand out in this price range. The ANC is working pretty well. It can cancel the outdoor noise up to 25dB, which is remarkably low.
Sound Quality
It comes with 10mm Dynamic Bass Boosted Drivers, which gives Deep Base Experience. It also has a composite diaphragm, making it clear to hear every beat of the song you are listening to.
Battery Life
The battery timing is pretty decent, which is 16 hours backup with a single charge with the case included. The battery life of each earbud is 4-5 hours. You can increase the battery time by turning off the active voice cancellation feature.


Charging Time
The case and buds can take up to 2 hours to fully charge. The LED light blinks while charging the case, and once it is fully charged, the light stops blinking and keeps On.
Gaming Mode
The latency time of these earbuds is 70ms. This makes them suitable for gaming. It also has a gaming mode, so the latency will be very low.
Pros
- The headphones have effective active noise cancellation and transparency mode.
- Good passive noise cancellation.
- Water and sweat resistant withIPX4 rating.
- There is also a dedicated gaming mode for low latency and balanced sound quality.
- The headphones also have numerous touch controls.
Cons
- average battery life.
- average mic quality.
- No app support for tweaking audio or future firmware updates.
Price and Availability
For the price, It’s available on this Amazon Store. Get 10% off by using our Coupon Code –> OFTOWN10
The Diamond On T300 Earbuds was launched in India but will be available in Southeast Asia and the USA soon.
Overall Review

Coster Diamond OnT300 is the best earbuds for listening to music and playing games. It has less charging time, and the design is something out of this world.
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