The headphones are single channel not dual channel A/B.
Product Features
2 Adjustable Infrared Wireless Head Sets NEW OEM
Power on / off with auto off to extend battery life
Adjustable to fit all head sizes
Soft padded ear pieces for comfort fit
Volume control on each headset
Noise cancellation and superior sound
FORD: 5F2T-19C013-AA 28008529
Compatible with the following YEAR/MAKE/MODEL
2007-2010 Mercury Mountaineer