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...

Convert 2.5mm plug to single 4P4C RJ9/RJ10 headset plug for your VOIP phone Compatible with most IP phone headset jacks: Nortel, Avaya, Aastra, ESI, NEC, RCA, Mitel, Lucent, Shoretel, Siemens, and more... Save money by buying standard phone headsets...

Convert 2.5mm plug to CISCO phone single 4P4C RJ9/RJ10 headset plug Save money by buying standard phone headsets to use with your Cisco phone headset jack Reduce clutter with single headset Does not work with RJ11 jack, which is wider than your...

 Due to out of stock - we will be sending a combination of 2 adapters to supplement this. All functions are the same.  Female RJ9 to Male 3.5mm plug headset adapter Convert RJ9/RJ10/RJ22 Headset to most smartphones with 3.5mm Headphone...

Adapts phones with a 2.5mm headset jack to either your corded headset amplifier jack, or to your wireless base station Easy to use and install Simple to use with most devices, amplifiers, and wireless base stations High-quality...

Compatible with Apple EarPod and other Apple / CTIA based headphones or headsets.  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,...

Adapts phones with a 3.5mm headset jack to either your corded headset amplifier jack, or to your wireless base station Easy to use and install Simple to use with most devices, amplifiers, and wireless base stations High-quality...

Convert 2.5mm headset plug to single 4P4C RJ9/RJ10 plug for your VOIP phone Compatible with most IP phone headset jacks: Nortel, Avaya, Aastra, ESI, NEC, RCA, Mitel, Lucent, Shoretel, Siemens, and more... Save money by buying standard phone...

Use a wireless headset or amplifier with your 3.5mm headset jack. Easy to use and install Simple to use with most devices, amplifiers, and wireless base stations High-quality manufacturing for extra durability Professional-grade wiring and superior...