HPPFOTRS New style fashione design Call Center monaural Headset RJ9 Crystal end Noise Cancelling Corded Headphone with Mic for Phone Desk Telephone Stylish appearance, special surface processing technology,Wear-resisting surface, protect hearing Clear chat in high quality.Strong noise cancelling function.Headphones rotating arm can rotate 300 degrees, convenient to wear on left or right ear. Head card can be stretched freely, more comfortable wearing. We offer three adapter (NO.1 line,NO.2 line, NO3 line). NO.1 Line: Cisco, digital / IP telephone.NO.2 Line: AVAYA, Panasonic digital / IP telephone NO.3 Line: other parts Analog desktop telephone. Without adapter line(NO.1.2.3 Line) can be used directly, including call centers dialpad, as well as most of the Analog desktop telephone (Philips, Siemens, CHIND-E, BOTEL etc. Most of Analog desktop telephone. NO.2 Line: AVAYA, Panasonic digital / IP telephone NO.3 Line: other parts Analog desktop telephone.) 5% discount will be offered if two items is placed, including telephone+telephone, telephone+headphone&telephone+Training Switch Adapter