Spracht Zum Dect 6.0 Headset + Base Station. Deskphone Use with up to 500 feet of Wireless Range Secure DECT 6.0 Wireless Protocol with up to 500 feet of range Compatibility: Universal Deskphone Compatibility using RJ9 Headset port (will not work with Cell Phone or Computer) Use over the head headband or ear hook Active DSP noise cancellation microphone Full Duplex for simultaneous conversations Rechargeable Lithium batter and up to 7 hours of talk time! Does NOT work with COMPUTER or Cell Phone - If you are looking for a Wireless Headset for your cell-phone using Bluetooth technology, check out the ZUm maestro HS-2050 as an option! Up to 500 feet of range Compatibilty: RJ9 Port for Deskphone ONLY.  (<span class="a-text-italic">not compatible with cell phone, bluetooth devices, or computers)</span> US, Canada, Europe, LAtin America Compatible Frequencies Secure DECT 6.0 Protocol Use over the head set or the ear hanger Active DSP noise cancellation microphone Full Duplex for simultaneous converstaions Rechargeable Li Ion battery; up to 7 hours talk time Dect 6.0 headset with recharger station Remote handset Lifter, RHL-2010 available (sold separately - no EHS compatibility)