Specifications Control phone through wireless headset Plug and play,easy to use Answer incoming call through remote wireless headset Terminate calls using remote wireless headset key Incoming calls are signalled in the headset earpiece Built-in a RJ12(6P6C) input port connected to IP phone 1x3.5mm output port for Plantronics headset Accessories: RJ12, 3.5mm Features Compatible with Jabra, Plantronics wireless headset Plantronics Modules: CS510, CS520, CS540 Jabra Modules: 9400BS (9460), WHB005BS(U) (925) Sennheiser Modules: SC230/260/660,DW Pro2,D10, SD Pro2 Packing Weight:0.12kg Box Size:68.8MM(L)*39.8MM(W) Phonebox Size:116MM(L)*80MM(W)*43MM(H)