SMS Audio Sync by 50

Four SMS Audio Sync-equipped users can connect to the included wireless dongle for group listening, Kleer Wireless streams sound much better than Bluetooth, and SMS includes a 3.5mm cable to use when the battery runs out.
Design
The Sync by 50s are built for listeners who take fashion seriously and shop for headphones that match their lifestyle, but the thin plastic covering the set doesn't inspire confidence for anyone using them on the go. If you have a chance to check them out in person, be sure to subject them to a simple creak test and you'll find that the thin plastic connecting the headband to the adjustable joints barely supports the weight of the heavy earcups, causing the set to sway side to side with discomforting flex when they're not firmly planted on your head.
I wouldn't feel comfortable using them to exercise despite what the marketing says, and I suspect the six tiny screws exposed at the bottom of the headband won't likely survive a single drop onto hard concrete or linoleum.
The wireless dongle that plugs into the audio source is an equally disappointing misfire in hardware design. Small details make a big difference in headphones, and the offset 3.5mm plug feels just as awkward and weak as those abhorrent FM transmitter attachments sms audio sync by 50 hp