The HD901 headphones feature dual 40mm drivers and an advanced CSR chip. In addition, the device offers wireless Bluetooth playback and wired playback via an included 3.5mm audio cable. Likewise, the unit incorporates a microphone for making and receiving phone calls, along with a TF Card slot for MP3 music. And for added portability, the headphones feature a foldable, collapsible and lightweight design with the ability to rotate 90° inward, a weight of only 5 ounces, soft earcups, and an adjustable headband.
Here's a full rundown of key specs and features per Mixcder:
Bluetooth wireless - pairs with cell phones up to 33 feet.
Wired with included 3.5mm audio cable – does not use battery time when in wired mode.
TF card slot music player for MP3 music.
Precision-engineered dual 40mm drivers.
Advanced CSR chip delivers high definition, smooth, balanced mid-range, and clear dynamic music.
HD sound.
Superior bass.
Extra lightweight at only 5 ounces.
Comfortable soft sponge ear muffs.
Adjustable headband.
Foldable space saving design: rotates 90° in for easy carrying and storage.