STI Wireless Chime Series: Doo...
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$64.29
STI-3350 Wireless Entry Alert with magnetic contact sensor and receiver, white

STI Wireless Chime Series: Doorbell, Entry Alert, Motion, and Extender Systems

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Model: STI-3300
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STI Wireless Chime Series: Doorbell, Entry Alert, Motion, and Extender Systems

STI Wireless Chimes deliver reliable audio alerts for residential and commercial use without the need for complex wiring. The series includes wireless doorbells, motion chimes, entry alerts, and extenders, all built for plug-and-play pairing. Each receiver accepts up to 10 transmitters, operates at 433 MHz over a 500 ft line-of-sight range, and offers up to 10 selectable sounds for zone identification. Receivers plug into a standard 120 VAC outlet; transmitters are battery-powered. Suited for homes, offices, and retail stores.

Key Features

  • 433 MHz operating frequency; range up to 500 ft (line of sight)
  • Up to 10 transmitters per receiver
  • Up to 10 selectable sounds (model-dependent; not available on STI-3300/STI-3331)
  • Compatible across all STI Wireless Chime transmitters and receivers
  • Plug-and-play installation; no wiring required (except STI-3331)
  • Receiver powered by 120 VAC; transmitters battery-powered
  • Weather-sealed, tamper-resistant transmitters
  • UL/cUL listed (except STI-3300 and STI-3331); FCC and IC compliant
  • One-year limited warranty

Manufacturer Resources

VIEW SPEC SHEET

Product Specs

Certifications:
UL/cUL (except STI-3300/3331), FCC & IC Compliant
Frequency:
433 MHz
Installation:
Plug-and-play; no wiring (except STI-3331)
Operating Range:
Up to 500 ft (line of sight)
Parent SKU:
STI-WIRELESS-CHIME-SERIES
Power Source:
Receiver plugs into 120 VAC; Transmitters battery-powered
Product Line:
STI Wireless Chime Series
Sound Options:
10 Selectable Sounds (except STI-3300/3331)
Tamper Resistance:
Weather-sealed Transmitters
Transmitters per Receiver:
Up to 10
Warranty:
One-Year Limited Warranty
Application:
Home, Office, Store
Compatible Devices:
All STI transmitters and receivers work together
Compatible Model:
All STI transmitters and receivers work together
Compatible Models:
All STI transmitters and receivers work together
Product Group:
Device Protection and Alarms
Product Subgroup:
Security Alarms
Product Type:
Wireless Alert Kit
Department:
Safety

Parts & Accessories

    Safety Technology International STI-3300 – Frequently Asked Questions

    1) How many STI wireless chime transmitters can I run to one receiver?
    Up to 10 transmitters pair to a single STI Wireless Chime receiver. That is what makes the series work for a small building rather than one door: a doorbell push at the front, an Entry Alert sensor on a back door, and a motion sensor over a stockroom aisle can all report to the same plug-in receiver. Every STI transmitter and receiver in the series works together, so you can mix device types on one receiver instead of buying a separate system per opening.
    2) Will an STI wireless chime reach from my warehouse back door to the front counter?
    The STI Wireless Chime Series is rated up to 500 feet line of sight at 433 MHz. Line of sight is the operative phrase: that number assumes an unobstructed path, and block walls, steel racking, or metal doors between the transmitter and receiver cut into it. For a run that crosses interior walls or floors, the STI-3331 Extender is the piece in the series that carries the signal further.
    3) Do I need to run wire to install an STI wireless chime?
    No wiring is needed for the transmitters, which are battery-powered and mount in place. The receiver simply plugs into a 120 VAC indoor outlet. The one exception is the STI-3331 Extender, which does require wiring. For a property manager adding a back-door alert to a leased unit or a retailer who cannot open walls, that plug-in receiver plus battery transmitter is the whole install.
    4) What is the difference between the STI doorbell, Entry Alert, and motion chime?
    Three different triggers on the same wireless platform. The doorbell transmitter is a push button, so someone has to press it. The Entry Alert sensor watches a door or gate and reports when it is opened, which is what you want on a stockroom or a back exit nobody should be using unannounced. The motion-activated sensor fires when someone crosses its field, so it covers an open counter, a driveway, or an unattended aisle where there is no door to sense. All three pair to the same receiver, so you can run more than one type at once.
    5) What do I have to order to get a working STI wireless chime setup?
    Two pieces minimum: at least one transmitter and one receiver. The transmitter is the trigger you pick by application, an STI-3301 doorbell push button, an STI-3551 Entry Alert sensor, or an STI-3601 motion-activated sensor. The STI-3353 receiver is the plug-in unit that makes the sound. A transmitter on its own has nothing to ring, and a receiver on its own has nothing to report to it. From there add up to nine more transmitters to the same receiver.
    6) Will an STI Entry Alert sensor hold up on an exterior door?
    The transmitters in the series are weather-sealed and tamper-resistant, which is what lets an Entry Alert or doorbell push go on an exterior door, a gate, or an unheated dock rather than only in conditioned space. The receiver is the indoor half of the system, since it plugs into a 120 VAC indoor outlet.
    7) Can I add an STI motion sensor to a chime receiver I already have?
    Yes. Every transmitter and receiver in the STI Wireless Chime Series works together, so a motion-activated sensor pairs to a receiver already running a doorbell push or an Entry Alert. All of it runs on 433 MHz. You are adding to the existing receiver's transmitter count, which tops out at 10.
    8) Does the STI-3331 Extender install the same way as the rest of the chime series?
    No, and this is the one to watch on a bid. The rest of the series is plug-and-play with no wiring, but the STI-3331 Extender requires wiring. It also falls outside the UL/cUL listing that covers the other models, and outside the 10-sound selection. Plan an electrician or a wired location for it; the transmitters and the receiver need neither.
    How fast can I get the Safety Technology International STI-3300 delivered?
    Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
    Can I return it if it doesn’t work for me?
    Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, 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-3300 come with a warranty?
    Absolutely. The Safety Technology International STI-3300 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-3300?
    You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
    Why buy the Safety Technology International STI-3300 from ZenSupply?
    ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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