EARTEC UL4S Ultralite-HD 4-Person Full Duplex Intercom - Clear Team

Our review of the EARTEC UL4S Ultralite-HD finds it to be a focused team communication system best suited for small crews who need reliable, hands-free voice coordination. The single biggest reason to buy is its full duplex capability on a 1.9 GHz band that lets four people speak and listen simultaneously without push-to-talk delays, making it practical for video and stage production, boat operators, and small construction teams who prioritize clear, immediate coordination.

Key Features

• Included kit: Comes with one main ULSM headset, three ULSR remotes, four rechargeable lithium batteries, a 10-bay multi-port charger and a softside carrying case for organized portability.
• Full duplex hands-free: Operates on 1.9 GHz to avoid common interference and allows simultaneous two-way conversation for all connected users.
• Expandable system: Ships configured for four users but can be expanded to include a fifth headset for slightly larger crews.
• Long range: Offers up to 1,000 ft line-of-sight range, useful for outdoor events, UTV or boat operations where team members can be spread out.
• Noise-cancelling clarity: The microphones reduce background noise and mute automatically when pivoted up to prevent unwanted transmission.
• All-day use design: Headsets pivot for left or right ear use and provide up to about six hours of talk time per charge for typical shift lengths.

Who It's For

The UL4S is aimed at small production crews, event staff, drone and boat operators, and other teams who need clear, simultaneous voice communication without constant hand signals or radios. Its single-ear design keeps one ear open to ambient sound, which is valuable on stages, sets and in outdoor work.

Those who should look elsewhere include users who require all-day continuous operation beyond six hours without swapping batteries, or teams needing integrated wired intercom or headset models with two-ear noise isolation for very loud environments. Large productions that need more than five users will want a different scalable system.

Pros & Cons

Pros

• True hands-free full duplex communication for natural conversation between crew members.
• Complete kit with multi-port charger and carrying case simplifies deployment and storage.
• Good audio clarity from noise-cancelling microphones, helpful in moderate background noise.
• Portable range of up to 1,000 ft LOS for flexible placement of team members outdoors.

Cons

• Battery life is generally adequate but customers report mixed experiences and occasional charger problems, so plan for spare batteries or checks before use.
• Single-ear design may not suit users who need full ear isolation in very loud environments.

Specifications

Headset configuration	1 main ULSM + 3 ULSR single-ear remotes
Included accessories	4 rechargeable lithium batteries, 10-bay charger, softside carrying case
Frequency	1.9 GHz
Operating range	Up to 1,000 ft line-of-sight
Talk time	Up to 6 hours per charge
Expandability	System expandable up to 5 users

Our Verdict

The EARTEC UL4S Ultralite-HD is a sensible choice for small teams that need immediate, hands-free voice coordination and clear audio in moderately noisy environments. It delivers practical range, a complete kit for quick setup, and the conversational convenience of full duplex operation, though buyers should verify battery and charger performance for their workflow.

Frequently Asked Questions

Can the system support more than four users?
Yes, the system can be expanded to support up to five users by adding an additional compatible headset unit.

How long do the batteries last on a charge?
Batteries provide up to about six hours of talk time on a single charge under typical use, so plan for rotation or spares for longer shifts.

Is the microphone good in noisy environments?
The headsets use a noise-cancelling microphone that improves clarity in moderate background noise and mutes when pivoted upward to avoid accidental transmission.