Use the included auxiliary cable to wire your sound directly or daisy chain other speakers.
Direct Your Sound
Choose between directional or omni-directional sound with the built in kickstand and grip ring.
On-board Controls
Change volume level and pairing mode with the on-board button array.
Take your music wherever you go
Key Features:
Share your music, everywhere
Wireless
Aux Input, Output
Directional or omni-directional sound
On-board Controls
Designed and engineered to deliver the Sound of Koss
Soft case included
1-Year Limited Warranty
Designing the BTS1
Small enough to fit in a pocket and weighing just 0.36 lbs, the BTS1 Wireless Bluetooth® Speaker is designed specifically for portability and on-the-go use.
"Fantastic sound for the size. Kickstand is a great idea. " Read more...
Customer Reviews 5 item(s)
Great quality, few minor defaults
Overall
We've had this product for many months now and are really happy with the overall quality.
The sound and portability are perfect for our needs.
The only negative points
To switch devices, you have to turn off the speaker and turn it back on while holding the power button for long enough. Other speakers offer the ability to support more than one device, which would have been a nice addition to this speaker for family uses.
The main problem with this speaker is the lack of an automatic power down feature when not playing any sound for a long time. Because of this, we've been woken up many times at 3 in the morning by the very loud low-battery warning.
If you're looking for a good quality sound and portable speaker, go for this one, but don't forget to turn it off!
Review by jfperusse /
(Posted on 1/26/2020)
Excellent small bluetooth speaker
Overall
I have been a Koss Porta-Pro fan for many years now. So when I heard the Koss BTS1 portable Bluetooth speaker, it was simply, “Wow!” The sound was crisp, clean and clear and no distortion with volume turned up to the max. The overall sound of the Koss BTS1 was excellent. The vocals, midrange and highs really shine. And the bass for this size speaker was more than adequate. I had shown the Koss BTS1 to my family and friends and they all have the same look of amazement when listening to it for the first time, all coming to the same conclusion, “Great sound!” Koss hits another homerun with the Koss BTS1. Highly recommended.
Review by Kev C. /
(Posted on 12/7/2018)
Fantastic sound for the size. Kickstand is a great idea.
Overall
I am pleased KOSS is still around. I once purchased the hv1 and wow there is a difference with KOSS. The sound and quality are flawless. Remember to understand how volume amplification and size with price go together. If you are looking for tons of bass, buy home speakers, this is a on-the-go speaker and is not made for high end , however, it covers enough base and treble for a ON-THE-GO device. There is no CHEAP in KOSS, just great sound , looks and priced right for the quality.
Review by Scramblepad /
(Posted on 6/30/2018)
VERY portable e high-quality "small sound"
Overall
I really love this little speaker. It does not have the bass a lot of people search, but it does have a very musical "small sound". It is REALLY lightweight and small. Very well and solid built. Very easy to use, to pair, and it charges from any powered USB port. Really convenient and not always we want the boomy speaker full of low frequencies... The only reason I didn't give FIVE STARS was because the battery is not user-replaceable, and it seems that KOSS will not replace them in the future, not even at a charge. That means, sometime down the road, when the battery stops holding charge, it will just no work anymore. Attention KOSS !! We want to hold on to this little speaker longer than the life of its battery !! Otherwise, this is a very nice little speaker.
Review by Enrico De Paoli /
(Posted on 8/17/2017)
It could be better, or cheaper...!!
Overall
Very well made, small enough to go in a jacket pocket, excellent midrange, not so good on the highs and lows, could be the size, but a little overpriced for that reason. I'm a musician and would like to hear the cymbals from the drum set and the bass and with this price i should be able to define them..!!!
Review by dimdais /
(Posted on 5/18/2017)
One Year Warranty 
John C. Koss, Founder