Open Ear Headphones Bluetooth 5.3 Truefree O1 - Safe Fit & Long

In this review of the Truefree O1 open ear headphones, the bottom line is simple: these are best for active users who need situational awareness and long battery life without sacrificing bass or call clarity. The open-ear, over-ear hook design keeps the earbuds stable during workouts or cycling and leaves the ear canal free, while the 16.2mm drivers and bass-enhancing algorithm provide a fuller sound than expected from open designs. The review focuses on comfort, call performance, battery endurance and how the O1 balances awareness with immersive audio.

Key Features

• Open-ear design: Keeps ears uncovered so you remain aware of traffic, announcements and ambient sounds while listening.
• Comfortable over-ear hooks: Delivers a secure, worry-free fit that prevents frequent falling out during running or other movement.
• 16.2mm drivers with bass enhancement: Produces a spacious soundstage and richer bass than typical open-ear earbuds for more immersive music and podcasts.
• Four microphones with ENC: Filters environmental noise and gives clearer voice pickup for calls in busy outdoor settings.
• 45 hours total playtime: Offers up to 10 hours per charge from the earbuds and up to 45 hours using the portable charging case for multi-day use.
• Bluetooth 5.3 and app control: Provides stable low-latency connections, multipoint pairing and EQ presets via the TRUEFREE app for customization.

Who It's For

The Truefree O1 suits runners, cyclists and commuters who need to stay alert to their surroundings but still want satisfying audio and reliable call performance. The open-ear form and secure hooks are useful for anyone who dislikes in-ear pressure or worries about earpiece loss during activity.

Those seeking full noise isolation or the absolute deepest bass should look elsewhere; closed in-ear earbuds or over-ear headphones will deliver stronger isolation and heavier low-end. Also, audiophiles wanting studio-detail fidelity may prefer wired or high-end wireless models with different driver configurations.

Pros & Cons

Pros

• Comfortable, bud-free wearing experience that keeps users aware of surroundings.
• Surprisingly immersive sound and punchy bass from 16.2mm drivers and the bass algorithm.
• Clear calls thanks to four mics and ENC noise cancellation in windy or noisy outdoor environments.
• Long total battery life with a 10-hour single-charge runtime and 45 hours with the case.

Cons

• Open-ear design cannot fully block external noise, so passive isolation and maximum bass depth are limited.

Specifications

Driver size	16.2mm
Design	Open-ear with over-ear hooks
Microphones	Four mics with ENC noise cancellation
Bluetooth	Bluetooth 5.3 (compatible with BT 4.0+)
Battery life	10 hours per charge, 45 hours with charging case
Special modes	Game mode via left earbud
App	TRUEFREE app for EQ and multipoint control

Our Verdict

The Truefree O1 is a strong choice for active listeners who value safety, comfort and long battery life while still wanting punchy sound and clear calls. It is good value for those who need an open-ear solution with stable Bluetooth 5.3 connectivity and app customization, though anyone needing full isolation or studio-grade accuracy should consider other form factors.

Frequently Asked Questions

Do these block outside noise?
The open-ear design intentionally exposes ears to ambient sound, so they do not provide passive noise isolation like in-ear or over-ear headphones.

How long does the battery last?
Each earbud lasts up to 10 hours on a single charge and the portable case extends total playtime to about 45 hours.

Can the earbuds connect to two devices at once?
Yes, multipoint connection is supported and can be managed in the TRUEFREE app for easy switching between two paired devices.