Supreme Trimmer Vader ST3778 Professional Cordless Barber Liner - Long

In this review the Supreme Trimmer Vader ST3778 is evaluated as a barber-grade cordless liner that also suits home users who want precise edge work. The bottom line: it is for anyone who needs a powerful, long-running trimmer for crisp line work and fades, with the single biggest reason to buy being the combination of a 7000 RPM motor and a Zero Gap DLC T-blade that delivers consistently sharp results and smooth cutting for beard, hair and body grooming.

Key Features

• 7000 RPM motor: Provides professional-grade power for clean, accurate cuts and steady performance during detailed edging and fades.
• Zero Gap DLC T-Blade: Diamond-Like Carbon coating keeps the blade sharp and reduces snags for crisp line work on all hair types.
• 210 minute runtime: A long-lasting lithium battery supports extended cordless use between charges, suitable for multiple clients or travel.
• USB-C fast charging: Recharges quickly via USB-C or charging dock and works with worldwide voltage for convenience on the go.
• Lightweight ergonomic design: Slim Vader body offers a secure grip and reduces hand fatigue during long sessions or barber shifts.
• LED battery display and kit inclusions: Real-time battery info plus 3 guide combs, charging stand, 2 USB-C cables, oil, brush, blade guard and travel bag make it ready to use out of the box.

Who It's For

The Vader ST3778 is aimed at barbers and serious home groomers who want a dedicated trimmer for crisp edge-ups, line work and close detailing across beard, hair and body. Its powerful motor and DLC T-blade are suited to professionals who need a dependable tool that handles different hair textures without tugging.

Those who primarily need a full-size clipper for heavy bulk cutting or who prefer rotary-style heads for scissor-over-comb work should look elsewhere; this model excels at precision finishing rather than bulk cutting. Users who dislike very sharp blades may want to take care when first using the zero gap T-blade.

Pros & Cons

Pros

• Strong cutting performance from the 7000 RPM motor for accurate trims and fades.
• Zero Gap DLC T-blade stays sharp and reduces snagging for smooth edge-ups.
• Impressive 210 minute cordless runtime with USB-C charging and LED battery display for clear status.
• Lightweight, ergonomic build and a complete kit make it practical for travel and professional use.

Cons

• Some users may find the T-blade extremely sharp at first and will need to adjust technique for close work.
• Designed for precision finishing rather than heavy bulk hair removal, so it may not replace a full-size clipper for all tasks.

Specifications

Brand	Supreme Trimmer
Motor speed	7000 RPM
Blade type	Zero Gap DLC T-blade (Diamond-Like Carbon)
Battery runtime	Up to 210 minutes
Charging	USB-C fast charging and charging dock
Included accessories	3 guide combs (13mm), charging stand, 2 USB-C cables, oil, brush, blade guard, travel bag

Our Verdict

The Vader ST3778 is a strong choice for barbers and dedicated home groomers who need precise, reliable trimming and long cordless runtime. Its powerful motor, DLC T-blade and thoughtful kit deliver good value for edge-ups and detailed work, though it is best paired with a full-size clipper if heavy bulk cutting is required.

Frequently Asked Questions

How long does the battery last on a single charge?
The lithium battery runs up to 210 minutes per charge and the LED display shows remaining battery so you can plan sessions.

Can the blade be adjusted for zero gap edging?
Yes, the Zero Gap DLC T-blade is fully adjustable for close trimming and crisp edge-ups across hair types.

What accessories are included?
The kit includes 3 guide combs (13mm), a charging stand, 2 USB-C cables, blade oil, cleaning brush, blade guard and a travel bag.