* Convert 3.5mm Smartphone plug to single 4P4C RJ9/RJ10 handset plug.
* Save money by buying a smartphone headset, or using your existing one with your Aastra phone's handset jack.
* Reduce clutter with single headset.
* Does not work with RJ11 jack, which is wider than your handset or headset jack (6 positions vs. 4). RJ11 jack is what is in the wall. RJ9, RJ10, RJ22 are what is on your phone handset or headset.
* Works best with 4-pole (TRRS) headsets. Not compatible with Apple EarPods. This amazing adaptor converts the standard 3.5mm smartphone plug to an Aastra RJ9, RJ10, or RJ22 handset plug, allowing you to use your favorite smartphone headset with your Aastra office phone. The adapter outputs binaural sound for stereo headsets, meaning you will hear sound out of both ears. The adapter cable is approximately five inches long.**Works best when paired with an amplifier**WarrantyFree returns, always!We have a 30-day, no-questions-asked return policy for all of our products as well as a one-year, 100% Satisfaction guarantee; We'll replace your Headset Buddy for free within the first 12 months.For further information about Headset Buddy's Warranty and Shipping & Returns policies select the imbedded links Listing and template services provided by inkFrog