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White polycarbonate cylinder exit door alarm with key lock cylinder and mounting hardware

Safety Technology International

Safety Technology International STI-6400 Exit Door Alarm Key Lock personal protective equipment

SKU CH-PD2W-EVYSQ

An exit door alarm with a key-lock cylinder that sounds a 95 to 105 dB piercing horn for 30 seconds, three minutes or continuously when unauthorised egress is detected

  • Key-lock activation prevents unauthorised exit attempts
  • Piercing horn at 95 to 105 dB alerts everyone nearby
  • Adjustable 30-second, 3-minute or continuous alarm duration
  • FCC and IC compliant for regulated installations
  • 9 V battery and mounting hardware included for immediate setup

Exit Door Alarm with Key Lock

The Safety Technology International STI-6400 is a standalone exit door alarm designed for commercial and institutional premises. It provides an immediate audible alert when a protected door is opened without authorisation. The unit suits facility managers, security staff and building owners who need a simple deterrent against unauthorised egress.

Cylinder lock control and flexible timing

The alarm activates only when the key-operated cylinder lock is turned to the armed position, giving authorised personnel silent passage. Installers choose between three alarm durations: 30 seconds, three minutes or continuous sounding until the key resets the unit. A 9 V battery powers the device and is included, so no external wiring or mains supply is required for operation.

Mounting hardware and reed switch included

The package supplies the mounting hardware and a reed switch assembly, allowing the alarm to detect door movement directly at the frame. The polycarbonate housing meets FCC and IC compliance for electromagnetic emissions. The alarm is not suited for environments that require silent visual signalling or integration with a central monitoring panel.

How it compares

Measured against everything we stock in Face Masks, Respirators & PPE, at today’s prices. Recalculated every night.

Price $54.99
Pricier than about 74% of the 5,612 comparable items (median $24.99).

Specifications

Product
Brand nameSAFETY TECHNOLOGY INTERNATIONAL

Questions about this item

How long will the 95-105dB siren sound before the battery drains?

The alarm duration is selectable at 30 seconds, 3 minutes or continuous; continuous mode will exhaust the 9V battery fastest.

Does the 95-105dB horn generate noticeable heat during a prolonged activation?

The piezoelectric horn produces sound with minimal heat rise; the polycarbonate housing stays cool even during the three-minute piercing cycle.

What door hardware is required before mounting the STI-6400?

A standard exit or entry door with a flat surface for the reed-switch magnet is all that is needed; mounting hardware is included.

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