Color: Black and Blue
Battery: 400mAh lithium battery
Working Range: about 33 feet
Bluetooth Version: 4.1
Bluetooth Mode: A2DP 1.2, AVRCP 1.0, HSP, HSF 1.5
Standby Time: about 120 hours
Playing Time: 7 hours
Charging Time: 2-3 hours
Battery Capacity: 400mAh
Support TF Card: up to 32G
Featured: It is easy to pair with devices that support Bluetooth function. Connecting device includes a smartphone, laptop, iPad, Kindle, etc.
TF card support, download songs into the TF card from the Internet and listen on your headphones. No need to connect with a music app or radio.
33 ft distance in open air range can be quite significant; Excellent sound quality, better for bass; less sound leak; Blocking most of noise by big ear cups around the ears.
Built-in a stereo microphone, talk to your friends by the headphone anytime. Separate control button, indicator light, and voice instructions. Very comfortable for extended wear.
This B3 type headset will meet your requirements. It is made of premium UV and has a foldable design. The most exciting function is that it supports TF cards(up to 32G), which allows you to listen to music without connecting to the phone or computer. You can also use a cable to connect it with your phone or another device.