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Audio Alerter Analog with Power Supply & 1201 cord

Please call to order

One Product Does It All!

  • Standardizing on this multi-purpose signaling device can replace dozens of single application products!
  • Use the Duet Plus with any brand of telephone system
  • Anyone who installs telephone systems needs to be familiar with this all purpose device
  • Approved for use with Nortel Norstar systems
  • Includes modular 2501 cord for easy installation with Norstar systems
  • Loud station ringing
  • Night bell
  • Internal 3.5 watt voice paging amplifier
  • Indoor or outdoor applications (use 8 ohm horn for outdoor applications)
  • Compatible with strobe (model 1126) or desktop visual alerter (model 1127)
  • Adjustable warble tone and volume
  • Low voltage trigger circuit – detects foreign voltage
  • Can use Duet Plus as a pre amp to send night ringing through an existing overhead paging system
  • Test button for warble sound – saves trips and time involved climbing up and down ladders
  • 94 dBA output (internal speaker), 112 dBA with 8 ohm horn
  • Power supply included
  • Comfortably priced
  • Actual size: 3″ x 5″
  • Please call for a custom wholesale quote for your installation
  • 1 year manufacturer’s warranty
  • User Guide/Application Notes represent common solutions. Please call us with questions regarding other possible applications with various phones.
BTP Model: AL-1825PM
MFR Part: 1825PM

Additional information

Weight 1 lbs
Dimensions 9 × 3.75 × 2.75 in


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User Guide AL-1825PM

Data Sheet AL-1825PM

Our Unmatched, Value-added Service Saves You Time, Money and Hassles:

  • Experienced consultants help you choose exactly the products you need, preventing unnecessary purchases
  • Free user setup help and training
  • 100% satisfaction guaranteed
  • Our team is committed to answering every call live during business hours
  • Same-day response to emails
  • Same-day shipping
  • Full warranty facilitated by BTP


For customer service, sales inquiries, and technical support, contact us Monday–Friday, 8-5 Pacific Time. (After-hours messages and emails are promptly returned the following business day.)

Call: 800-457-4287 or 425-649-9262

Email: info@btpi.com

Quick ship, standard stock.

This item is normally in stock. Orders received Monday-Friday by 2:30 pm Pacific Time, ship the same day.

If this product is out of stock or on backorder from the manufacturer, a BTP Customer Service Representative will notify you by phone or email with an estimated ship date. If your order includes some in stock products, you may request a partial shipment of in stock item(s) with the out of stock item(s) to follow when available.

BTP does everything possible to eliminate delays and unnecessary expense associated with returns. At least two members of the BTP team will review your order for accuracy. If we have any questions or concerns about your order, such as two incompatible products, we will contact you right away.


“Ah, you are so kind.  We both really enjoy having your team working with us – you guys have made the headset nightmares we used to have go completelyRead more

Jeff B., Snohomish, WA