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STI-3551 Wireless Entry Alert Sensor
The STI-3551 is a wireless transmitter and magnet set for the STI 2015 Musical Wireless Chime Series. The chime receiver sounds when the transmitter and magnet are separated, providing an immediate audible alert whenever a door or window is opened. Use it to add monitoring points to an existing system or to extend coverage to additional entry points.
Key Features
- Part of the STI 2015 Musical Wireless Chime Series
- Additional transmitter and magnet for monitoring doors or windows
- Chime activates when transmitter and magnet are separated
- 10 selectable sounds - changeable with a single button press
- Output: 64 dB to 88 dB at 1 ft. (see installation sheet for full decibel ratings by sound selection)
Manufacturer Resources
Product Specs
- Product Group:
- Safety
- Product Subgroup:
- Detection Devices
- Product Type:
- STI-3551 Wireless Entry Alert Sensor
- Department:
- Safety
Safety Technology International STI-3551-PARTS – Frequently Asked Questions
1) Does the STI-3551 Entry Alert sensor work on its own, or do I need a chime unit too?
The STI-3551 is a transmitter and magnet only, not a complete alert system. It is part of Safety Technology International's 2015 Musical Wireless Chime Series and is meant to be added to that system, where the chime unit is what actually sounds. If you have no chime receiver yet, order one along with the sensor.
2) Can I add a second or third door to an STI Musical Wireless Chime system?
That is exactly what the STI-3551 is for. It is an additional transmitter and magnet for the 2015 Musical Wireless Chime Series, so a property manager or shop owner already running one chime can bring a back door, stockroom door, or side entrance onto the same system by adding sensors rather than buying another complete kit.
3) What triggers the STI-3551 door sensor, opening the door or someone walking past?
Door movement, not motion. The STI-3551 is a two-piece magnetic contact: one half is the transmitter, the other is the magnet, and the chime sounds when the two are separated. Traffic walking by an open doorway will not set it off, so it is the wrong choice if you want to catch people entering a room with no door to break contact on.
4) Is an STI wireless entry alert chime loud enough to hear in a noisy shop or a back office?
Output on the 2015 Musical Wireless Chime Series runs 64 dB to 88 dB measured at 1 foot, with the level depending on which of the sounds is selected. At the top of that range it carries through a normal retail floor or front office. In a running machine shop or an equipment room, plan on placing the chime close to where staff actually stand rather than relying on it from across the building.
5) Does the STI-3551 entry sensor need to be wired back to anything?
No wiring runs to the sensor. The STI-3551 is a wireless transmitter paired with a magnet, which is what makes it practical on a leased storefront, a tenant unit, or any opening where you are not going to pull cable through a finished frame.
6) Can you change the tone on an STI Musical Wireless Chime, or is it stuck on one sound?
Ten sounds are selectable, and they are changed with the push of a button rather than a dip switch or a programming sequence. That matters where more than one alert device is running in the same space, since a tone nobody else on site is using keeps staff from ignoring it.
How fast can I get the Safety Technology International STI-3551-PARTS delivered?
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Can I return it if it doesn’t work for me?
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reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Safety Technology International STI-3551-PARTS come with a warranty?
Absolutely. The Safety Technology International STI-3551-PARTS is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Safety Technology International STI-3551-PARTS?
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