Line Card

Prevent Unauthorized Exits with the STI-6400 Exit Stopper

Jun 3, 2025 | Access Control

STI-6400 Exit Stopper

Cut the Core Drilling: SDC WPT Wireless Power Transfer Device Makes Retrofits Easy

Messing with door cores is one of the biggest headaches for security dealers retrofitting electrified hardware—especially when dealing with wood or fire-rated doors. Fortunately, the SDC WPT Wireless Power Transfer Device solves that problem by delivering power and data across the door gap without any moving parts, wires, or core drilling.

Ideal for both retrofit and new construction, this RF-powered solution simplifies installations, minimizes vandal-prone wiring, and keeps projects on schedule. Whether you’re updating an older access control system or installing electric locks on a wood or steel door, the SDC WPT gives you the power—literally—to get the job done cleanly and compliantly.

Key Product Features

  • Wireless RF power transfer—no door core drilling required
  • Compatible with steel and wood doors
  • Transfers both energy and data (REX, DPS, latch status)
  • Visual LED status indicator
  • Field-selectable dual voltage output (12VDC or 24VDC)
  • Up to 1/4” (7mm) door gap tolerance
  • Flexible mounting on latch, hinge, or top frame
  • No moving parts or exposed wires—zero wear points
  • Adjustable unlock trigger (1–90 seconds)
  • Includes fixed 4-second unlock trigger for standard REX

Use Cases & Dealer Benefits

The WPT is a retrofit-friendly, code-compliant solution designed for:

  • Failsecure Electrified Locks and Latches: Power mortise, cylindrical, or rim locks without wiring hassles.
  • High-Traffic Doors: Reduce wear and tear from wire loops and moving parts.
  • Historic and Finished Doors: Maintain door aesthetics without compromising functionality.
  • Healthcare and Schools: Perfect for touchless entry installations using wave-to-open sensors.
  • Compliance Upgrades: Ideal for projects needing to meet UL fire and burglary ratings.

Why Dealers Love It:

  • No Core Drilling = Faster Installs: Save labor and avoid damaging fire-rated or wood doors.
  • Reduced Callbacks: No wires to break or degrade over time.
  • More Tolerant Alignment: Easier to install than inductive wireless devices.
  • Upsell Opportunity: Bundle with electrified locksets, exit devices, and wave-to-open switches.
  • Profitable Retrofits: Unlock more margin on existing door openings where wiring is difficult.

Technical Summary

  • Power Input (Frame Side): 600 mA @ 24 VDC
  • Power Output (Door Side):
    • 600 mA @ 12 VDC
    • 300 mA @ 24 VDC
  • Door Gap Tolerance: Up to 1/4″ (7mm)
  • Alignment Tolerance: Horizontal & vertical < 5/64” (2mm)
  • Dry Inputs:
    • (1) 4-second fixed unlock trigger
    • (1) 1–90 second adjustable unlock timer
  • Dry Outputs (Frame Side):
    • (2) SPDT, 1A @ 30 VDC resistive
    • (2) SPST-NO, 100 mA @ 60 VDC resistive
  • Environmental Rating: -4°F to 140°F
  • Weight: 1 lb
  • Certifications:
    • UL 10C Positive Pressure Fire Tests
    • UL 1034 Burglary-Resistant Locking Mechanisms

Note: For use with failsecure (power-to-unlock) locks only. Not compatible with failsafe or continuously dogged locks.

How the SDC WPT Works

Unlike inductive systems that require precise coil alignment, the WPT uses RF energy, which:

  • Transmits power as radio waves across the door gap.
  • Converts the RF signal into usable DC voltage via an internal receiver.
  • Transfers data (REX, DPS, latch status) along with power.
  • Is less sensitive to vertical and horizontal misalignment than coil-based systems.

This makes the WPT more installer-friendly and reliable in real-world deployments—especially in field conditions where perfect alignment isn’t always possible.

Accessory Highlight: WPT Drill Jig

For installers working with solid or particle-filled wood doors, SDC offers a WPT Drill Jig Assembly (part #SDC-WPT), available from JustDoorToolz. This makes prep quick, clean, and precise—ensuring a secure, code-compliant fit for every install.

Partner with SESP for Your SDC Installations
Southeast Security Products represents SDC and other best-in-class manufacturers across the Southeast U.S., offering hands-on support, product expertise, and dealer-focused programs to help you grow your business. Whether you’re building your first smart home package, upgrading to next-gen connectivity, or integrating high-performance technology into a larger security system, we can help you select the right solutions to power your installations. Contact us today for pricing, training, or to request a demo of the WPT Wireless Power Transfer Device.

Visit sesproducts.com or reach out to learn more about how we can support your next project.

Unauthorized exits can cost businesses thousands of dollars in theft, shrinkage, and liability—and they’re often completely avoidable. The STI-6400 Exit Stopper is a powerful deterrent that alerts staff the moment someone attempts to open a protected door. Whether you’re securing a retail back door, a school hallway exit, or a hospital stairwell, this cost-effective alarm helps protect facilities without impeding emergency egress.

Security dealers and low-voltage integrators looking for a profitable, plug-and-play solution for nuisance exit activity will find the STI-6400 Exit Stopper an ideal fit for a variety of commercial installations.

Key Product Features

  • 95 or 105 dB alarm (selectable at installation)

  • Indoor and outdoor models available

  • Polycarbonate housing is highly durable and UV-resistant

  • Compact profile for aesthetic installations

  • Built-in key override and tamper-resistant switch

  • Audible alarm sounds when protected door is opened

  • Powered by 9V battery (included)

  • Optional remote monitoring connections (Form C relay)

  • Delayed alarm or immediate alarm activation

  • Red or green cover options for compliance or branding

Use Cases & Dealer Benefits

The STI-6400 is used anywhere unauthorized exits or entry pose a risk to safety, operations, or asset control. These include:

  • Retail Stores: Prevent back-door theft by alerting staff when someone exits through non-public doors.

  • Schools & Campuses: Deter students from using side exits or propping doors open.

  • Hospitals & Healthcare: Control access to staff-only areas and improve patient safety.

  • Theaters, Restaurants & Event Venues: Stop patrons from sneaking in or using emergency exits for convenience.

  • Factories & Warehouses: Monitor secondary exits or fire doors prone to abuse or improper use.

Why It Matters for Dealers

  • Easy Install: Surface-mount with minimal wiring—ideal for retrofits.

  • Fast Turnaround: Most installs can be completed in under an hour.

  • High-Margin Add-On: Adds value to door hardware or intrusion installs.

  • Reduces Callbacks: Proven, reliable technology from STI, with few moving parts.

  • Code Friendly: Designed not to restrict egress, helping integrators avoid life safety conflicts.

Installation & Configuration Tips

Installing the STI-6400 is straightforward, but a few best practices can improve results:

  • Mount Height: Position the unit slightly above the panic bar or handle for maximum visibility and sound coverage.

  • Wiring the Relay Output: The optional Form C dry contact can be integrated with access control systems, intrusion panels, or remote annunciators for added monitoring capabilities.

  • Sound Level Setting: Use 95 dB for low-noise areas like offices; use 105 dB in high-traffic or loud environments like warehouses.

  • Delay Settings: Set a 15-second delay when the door needs to remain open briefly without triggering a nuisance alarm.

  • Battery Access: The STI-6400 features a hinged cover for quick battery replacement without removing the unit from the wall.

For outdoor or high-moisture areas, use the weatherproof version (STI-6400WIR), which includes a gasketed housing and conformal-coated circuitry for extended durability.

Dealer FAQ

Can I connect this to an access control system?
Yes. The STI-6400 includes a Form C dry contact relay that can signal a control panel or building management system.

Is this code compliant for fire exits?
The Exit Stopper is designed not to restrict egress and is commonly installed on fire doors. Always confirm with the local AHJ for code compliance.

How often should I replace the battery?
Typical 9V battery life is 6–12 months depending on usage. We recommend checking during routine maintenance or alarm inspections.

Are there color options?
Yes. Red and green models are available. Green is often used for compliance in jurisdictions that require green for emergency exit-related devices.

Technical Summary

  • Model: STI-6400 Exit Stopper

  • Alarm Output: 95 or 105 dB (user-selectable)

  • Power Supply: 9V alkaline battery (included); optional 12-24VDC wired version

  • Tamper Switch: Built-in reed switch and tamper detection

  • Relay Output: Form C dry contacts for remote monitoring

  • Material: Tough polycarbonate housing—same used in protective gear

  • Dimensions: 5.375″ H × 5.375″ W × 2″ D

  • Environment: Indoor standard; outdoor weatherproof models available

  • Mounting: Surface mount over existing door hardware, or wall/door frame

  • Certifications: UL Listed, ADA compliant, RoHS

  • Accessories: Remote horn, replacement covers, conduit kits, and backboxes available

Partner with SESP for Your STI Installations

Southeast Security Products represents Safety Technology International (STI) and other best-in-class manufacturers across the Southeast U.S., offering hands-on support, product expertise, and dealer-focused programs to help you grow your business. Whether you’re building your first smart home package, upgrading to next-gen connectivity, or integrating high-performance technology into a larger security system, we can help you select the right solutions to power your installations. Contact us today for pricing, training, or to request a demo of the STI-6400 Exit Stopper.

Visit sesproducts.com or reach out to learn more about how we can support your next project.

Related Content and Links

    Categories