Overview
For HTC, Bluetooth Earmuffs provide cotton blend construction that is both fashionable and warm in cold weather. With a built-in lithium-ion battery and a USB charging option, these earmuffs also allow you to talk on the phone directly through your audio device and answer speakerphone calls, delivering long standby time and convenience on-the-go.

Specification
Product Specifications:
Bluetooth version: V3.0 EDR
Frequency: 2.4026GHz-2.480GHz
Transmission distance: 30 feet or less
MICROPHONE transmission distance: ≤ 2m
Lithium-ion battery: 3.7V / 120mA
Charging time: 2.5 hours
Standby time: 60 hours
Continuous working time: about 4 hours