This Eartec Single Muff Ultralite HD Remote Headset will only work with 1x Master headset or HUB. Up to 4 Remote Headsets can be used with 1x Master Headset without the requirement of a HUB. Since UItraLITE headsets feature self-contained. -"All in One-" design all electronics even the battery is installed in the headset plastics. The batteries are lightweight and about the size of a book of matches. They charge in about 3 hours run for 6 hours and can be changed out in seconds. Since they are Lithium-ion the batteries do not have to be drained after each use and will never develop a memory.Change battery in Seconds Eartec UltraLITE units require a minimum of at least 2 headsets to communicate A working system requires 1 Master and at least 1 Remote Master and Remote headsets are This is a Remote headset that will only work with 1x Master headset Up to 4 Remote Headsets can be used with 1x Master Headset without the requirement of a HUB FeaturesFull-duplex/simultaneous talk wireless communicationExpandable to up to 5 users without a hubNo license base station wires or beltpacks requiredSimple operation - just turn the headset -"ON-" and talkWear ear cup on the left or right earRange up to 300 meters open air line of sight - remotes from the master Light and comfortableLong battery lifeRechargeable Lithium BatteryFully charged battery lasts: up to 6 hours3 hours to gain a full chargeLi-ion battery does not have to be -"drained-" after each use/no memory developed 3.7 V 800 mAh 3.0 WhMaster headphones can not be used together with the HUBCurrent Eartec UltraLITE HD version headsets are not compatible with older non HD modelsStandard - DECT 6.0 Digital Enhanced Cordless Telecommunications Frequency - 1920 - 1930MHz USA UK/EU Frequency: 1880 - 1900MHz UK/EU SpecificationsChannel Bandwidth: 1.728 GHzModulation Type: GFSKTransmission Speed: 1.152 Mbps Baud Rate Duplexing: Time Division Duple
