One of the perks of this job is the occasional invitation to take a close look at a range of products. Usually the device is something I would never consider using, rendering the review moot. So it was a pleasant surprise this week when a pair of wireless earphones arrived at the door.

The K True Wireless Headphones (Kfit) are designed by KuaiFit, which insofar as I can tell is a web-based sports training outfit that offers personal training and related apps and devices to get you moving. It’s the first venture into wireless by KuaiFit, although they do offer wired micro-headphones and other sensor-based products related to personal fitness.

At first blush, there are small but sturdy. I don’t think dropping them repeatedly will have any effect on reliability. KuaiFit tells me they weigh only 4.1 grams and have 3-6 hours of play time. Charging is done via a standard USB (included).

I tested out the earphones on a range of songs, from rock to country to classical. (Jazz lovers, find another reviewer!) I streamed the following tracks using Amazon Music:

• Mozart, “Serenade in G K.525”
• Beethoven, “Piano Sonata 14 in C Sharp Minor”
• Travis Denning (“David Ashley Parker from Powder Springs”)
• Eric Church, “Desperate Man”
• Zebra, “Whose Behind the Door”
• Rush, “The Spirit of Radio”
• Pete Yorn, “Strange Condition”

With any micro headset, audio quality is going to be compromised somewhat. I would characterize the sound as clear albeit a bit tinny, with some loss on the low-end. No real surprise there. Streaming wasn’t perfect; there were occasional dropouts. Not so much to be a deal-breaker, but enough that I must disclose them here. The music softens when a text alert is incoming; a plus.

Because these are intended as sport headphones, I took a short run with them in. (Imagine the annoyance if one fell out on a run, especially in dim light.) They are really comfortable and — just as important — do stay in place. They also passed the comfort test of my 12-year old son, who was notably impressed. They come with various eartip sizes, which are simple to switch out.

Since KuaiFit specializes in sports fitness, there are also downloadable apps which can be tied to KFit for custom training plans (running, cycling, gym, triathalons, etc.) I haven’t explored those yet.

All in all, Kfit is a cool innovation. They are funding the new device through Kickstarter. See below for details:

https://www.kickstarter.com/projects/1384443073/k-sport-headphones-with-in-ear-personal-trainer?ref=9czlv5