Check the listing for details. Eartec ULDM UltraLITE Double-Ear Rechargeable Battery Wireless Headset (Master). Color: Gray, Condition: New. Listed at 205.00 USD. Duplex Wireless Rechargeable Lithium Battery Durable Headset - USA Authorized Dealer!UltraLITE are breakthrough full duplex wireless headsets that provide hands-free, two-way voice communications. At the heart of these systems is a specialty "Master" headset that relays the digital signals generated by up to three "Remote" units. The resulting open line talking pattern allows up to 4 people to talk simultaneously without pushing buttons. To formulate your standard UltraLITE system select any combination of Double or Single ear headsets - up to 4 units.Key FeaturesSelf-contained "all-in-one" design: eliminates wires or belt-worn radiosWear on left or right ear: mic boom swivels 270 degrees. Dect technology: digital enhanced cordless telecommunicationsLithium polymer batteries: provide continuous for 6 hr operationNo FCC licensing: ready to go right out of the box.Technical SpecificationsStandard: DECT 6.0 (Digital Enhanced Cordless Telecommunications)Frequency: 1920 - 1930MHz (USA)Euro Frequency: 1880 - 1900MHz (EURO)Weight: 4 ozChannel Bandwidth: 1.728 GHzModulation Type: GFSKTransmission Speed: 1.152 Mbps (Baud Rate)Duplexing: Time Division Duplex (TDD)Speech Encoding: ADPCM / 32bit/sRF Accessing: Time Division Multiple Access (TDMA)Range: 400m in open spaceHeadset Power Supply: Rechargeable Lithium 3.7 V/ 800 mAh 3.0 WhCharger Power Supply: AC / adapter: INPUT 110-40Vac OUTPUT 5.0V - 1 1000mACharge Time: 3 hoursOperation Time: 6 hoursNormal Condition of Use: 0 C to 10 CStorage Temperature: -10 C to 60 C