sweat or water. And this a rechargeable battery that lasts up to 6 hours you can stay on the go.

Specifications:
Special features: Bone conducted sound, waterproof rating of IPX7, noise cancelling microphone
Color: Black, Red, White
Sensitivity: 123 + 5dB
Playback time: 6 hours
Bluetooth range: 10m
Connectivity: Bluetooth, Wireless
Weight: 49g
Model Number: whv008
Bluetooth V4.0
Charging time: 0.5-1 hour
Standby time: 30 days
Connection range: up to 10m
Frequency Response: 20Hz-22 KHz
Battery: 200mAh Li-ion

What is included:
1 x Bond Conduction Wireless Bluetooth Headphone
1 x USB Cable
1 x user Manual

36:T56f,Works alright - battery life is very good (can play for a few hours for 3-4 days without having to recharge), recharge rate is fast, audio quality is pretty decent for bone conduction style headphones. Note, however, bluetooth wireless technology is not as solid performing as, say, 802.11x.. you will notice these (among others) headphones disconnect randomly/intermittently when your phone is in your pocket and you're walking/running outside. This seems to be far less of an issue when inside, only seems to be a major problem when you're outside. Almost appears to be a proximity broadcast issue with bluetooth; being inside an enclosed space with no wind or breeze seems to improve signal quality.These don't work well for those with smaller head size, as the headphones largely rely on the pressure of the band pressing the headphone speakers to your face, to hold its position on your head. Your ears also help with this as the headphone band will try to rest on your ears as well. Not the most comfortable headphone, but if you want something to wear while running around doing tasks/errands at work, home, working at your desk, etc. these are perfect. I also wear them to the gym, but can be a problem if you prefer absolute noise-cancellation, as these are bone conduction style and you'll still hear background nois