3.5mm Female Headset to 2.5mm Male Adapter - Use your smartphone/iPhone headset with your home or office phone Why buy and carry around a second headset just for your phone? Get the Headset Buddy Adapter and use your existing smartphone headset with your home, office, or cell phone that has a 2.5mm plug. A space saver for home businesses, call centers, sales people, road warriors, or anyone who wants to use a low-cost, comfortable iPhone/smartphone headset with their office or home phone. Specs: Adaptor converts 3.5mm TRRS stereo headset plug to 2.5mm plug. Since most 2.5mm devices are mono, you will only hear mono-channel sound in one ear. EU RoHS Compliant. Compatible Phones: Altitouch AT&T Synj, 992, 1080, 1070, 1040, 993 Blackberry Cisco General Electric (GE) home phone LG Cosmos Linksys SPA 921, SPA 922, SPA 941, SPA 942, SPA 962 NEC home phone Nortel WLAN 2210, WLAN 2211 Northwestern Bell home phone Palm Panasonic Philips home phone Polycom SoundPoint IP 320, 321, 330, 331 RCA Executive Series, Visys Sony home phone Thomson home phone Uniden home phone V-Tech home phone Compatible With 3.5mm Stereo Headsets for: iPhone first generation, 3G, 3GS, 4, 4S, 5, iPad 1/2/3/4 Android smartphones Blackberry Palm Pre, Treo Pro, Pixi Motorola Droid HTC LG Motorola Nokia Samsung Sharp Original Sidekick LX Sharp Sidekick 2008 / Gekko Sony Ericsson Xperia X1 GSM T-mobile Windows smartphones