The Eartec UL5S is a full-duplex wireless intercom suitable for facilitating communication among five people. It comes with one single-ear master headset for the team leader and four single-ear remote headsets for everyone else. All technology necessary for operating the intercom system, including batteries, has been built into the headset's ear cups. This eliminates the need for wires or belt-worn items. Five rechargeable Lithium batteries, an eight-bay multi-port charger, and a soft-side case are provided. Manufacturer Included Items: Eartec UltraLITE Single-Ear Master Headset with Rechargeable Lithium Battery (USA Version) 4 x Eartec UltraLITE Single-Ear Remote Headset with Rechargeable Lithium Battery (USA Version) 5 x Eartec Rechargeable 3.7V Lithium-Ion Battery for UltraLITE & HUB Systems Eartec 8-Bay Multi-Port Charging Base AC Adapter Soft-Side Case (Medium Size) Bundle Item Includes: Eartec UL5S 5-Person Full-Duplex Wireless Intercom with 5 UltraLITE Single-Ear Headsets Goby Labs Headphone Cleaner Goby Labs Mic Cleaner 6AVE Electronics TM MicroFiber Cleaning Cloth