Supports the DECT 1.9 standard wireless technology. Wireless DECT standards vary depending on local legislation. Jabra DECT wireless headsets cover the most recognized DECT standards including European standard DECT and US DECT 6.0..Talk Range feet: Up to 325-Feet Talk range defines how far away you can be from the headset base and still be connected and carry on a conversation.Conference call capacity: 4 Up to 4 headsets can be joined to one base at the same time for conferencing call purposes A straightforward wireless headset designed for use with most major desktop phone systems. A cost-effective option for use in most office environments. It is easy-to-use and implement, resulting in fast user adoption.