Single-ear Ultralite headphones 4 units kit ( 2 double-ear - 2 single-ear)
System doesn't need a hub to work(up to 4 units)

Distance Over 1000' Range 304,8 m
Headsets' Mic Boom Swivels 270°
Includes 8-Port Charging Station and Carrying case

Be aware that :
- for many headphones , If you use HUB you can't have more than one Master slave, but one master only which can work with up to 6 slave and one connected with HUB.
- If you have a Master headphone ( no hub ) up to 3 slave.
- in no case is possible to have in the same partyline more than one master.

Designed to facilitate wireless coordination and communication, the UL4D UltraLITE from Eartec is a 4-person dual-eared headset system suitable for use on film sets, theater sets, and more. Each headset weighs only 4 oz, can receive audio at a speed of 1.152 Mbps, and can last six hours before requiring a recharge, which you can accomplish via the included charging station. Its microphone can swivel 270°. When you're done, simply pack it all up in the case. These headsets will receive audio at ranges of over 1000'.

Headset
Standard Digital Enhanced Cordless Telecommunications (DECT 6.0)
Frequency 1920 to 1930 MHz
Channel Bandwidth 1.728 GHz
Modulation Type GFSK
Transmission Speed 1.152 Mbps (Baud rate)
Duplex Operation Time Division Duplex (TDD)
Speech Coding ADPCM / 32-bit/s
RF RF Accessing: Time Division Multiple Access (TDMA)
Range 1312.3' / 400 m in open space
Power Supply Rechargeable Lithium battery, 3.7 V, 800 mAh, 2.0 Wh
Charger AC adapter
Input: 110-40 VAC
Charge Time 3 hours
Operation Time 6 hours
Operating Temperature 32 to 50°F / 0 to 10°C
Storage Temperature 14 to 140°F / -10 to 60°C
Weight 4 oz / 113.4 g (per headset)
Packaging Info
Package Weight 4.6 lb
Box Dimensions (LxWxH) 12.2 x 9.4 x 7.1"