Eartec UL4S Ultralite Full Duplex Wireless Headset for 4 - Clear Team

In this review of the Eartec UL4S Ultralite kit, the bottom line is simple: teams that need reliable, hands-free voice coordination over short distances will appreciate its dependable full duplex performance. The package is aimed at small crews-video and stage production teams, boat operators, drone pilots and light construction crews-who want uninterrupted, simultaneous communication for four users with clear audio and practical accessories. The included 10-bay charger, spare batteries and soft case make it an especially useful choice for workflows where keeping everyone charged and communicating matters more than having extra bells and whistles.

Key Features

• Full duplex wireless: Allows all four users to speak and hear simultaneously on a 1.9 GHz channel to reduce interference and keep conversations natural.
• Included kit components: Ships with 1 main ULSM headset, 3 ULSR remotes, four rechargeable lithium batteries, a 10-bay multi-port charger, a softside case and Solid Signal cleaning wipes for storage and maintenance.
• Impressive range: Provides up to 1,000 ft line-of-sight range so small outdoor shoots or operations across a yard remain connected without constant signal loss.
• Decent battery life: Up to 6 hours of talk time per charge, and the multi-port charger plus spare batteries help keep a full crew running through a workday.
• Noise control: Pivoting noise-cancelling microphone mutes when flipped up and improves voice clarity in higher-noise environments.

Who It's For

The UL4S is best for small teams that require simple, robust coordination: indie film crews, live sound and stage technicians, drone operators working in open areas and small maritime crews who need clear two-way communication up to about 1,000 ft LOS. Its hands-free full duplex operation is ideal where conversations are frequent and natural interjection is necessary.

It is less suited for very large crews who need more than four simultaneous users, for projects needing extended battery runtimes beyond a single 6-hour span without swapping batteries, or for environments requiring advanced Bluetooth integration or smartphone app control.

Pros & Cons

Pros

• Reliable full duplex operation for natural, simultaneous conversations among four users.
• Comprehensive kit with charger, spare batteries and case simplifies field use and logistics.
• Noise-cancelling mic delivers clear voice quality even in windy or noisy settings.
• Solid line-of-sight range for outdoor and large indoor spaces makes it flexible for varied workflows.

Cons

• Battery life is adequate but not exceptional; users should plan to rotate batteries for long shifts.
• Designed for four users only, so expanding the system requires an additional solution.

Specifications

Included headsets	1 ULSM main, 3 ULSR remote
Wireless frequency	1.9 GHz
Wireless range	Up to 1,000 ft LOS
Talk time	Up to 6 hours per charge
Power accessories	4 rechargeable lithium batteries, 10-bay multi-port charger
Extras	Softside case, Solid Signal cleaning wipes

Our Verdict

The Eartec UL4S Ultralite kit is a pragmatic choice for small teams needing clear, hands-free voice communication without complexity. It combines full duplex clarity, a useful accessory bundle and a practical range that delivers strong value for production crews and operators who prioritize dependable, simultaneous comms over advanced connectivity features.

Frequently Asked Questions

How many users can communicate at once?
The system supports simultaneous full duplex communication for four users.

How long will the headsets run between charges?
Each headset delivers up to 6 hours of talk time on a single charge; the included spare batteries and 10-bay charger help extend operational time.

Will it work in noisy outdoor conditions?
Yes; the noise-cancelling microphone improves voice clarity and automatically mutes when pivoted up, helping in windy or high-noise environments.