Scantronic SDR-2R-INT | Wireless Internal Sounder | 80dB Output, Grade 2

FAQs

Where would you typically install internal radio sounders on a residential system?

You’ll find internal radio sounders most valuable in areas where clients need to hear system feedback but are beyond comfortable hearing distance of the main panel or keypads. Common installations include entrance halls and porches where occupants need clear entry/exit tone confirmation, first-floor bedrooms in two-storey properties where the panel is located downstairs, rear extensions or conservatories added after the original installation, and annexes or outbuildings within radio range of the main system. Properties with open-plan layouts often benefit from additional sounders in sleeping areas, ensuring alarm signals wake occupants despite distance from the main panel. The 700-metre radio range gives you considerable flexibility for positioning, though you’ll want to verify signal strength during commissioning, particularly in properties with thick stone walls or metal-framed construction that can attenuate wireless signals.

Can you mix SDR-2R-INT internal sounders with conventional wired sounders on the same system?

Absolutely—you’ll often find this approach offers the best balance of cost and coverage on larger installations. Your main wired internal sounder connects to the panel as standard, providing audio feedback in primary areas, whilst wireless SDR-2R-INT units extend coverage to remote locations without the expense of cable runs. This hybrid approach is particularly cost-effective on retrofit installations where some areas have existing wiring infrastructure whilst extensions or conversions require additional coverage. The control panel treats all sounders—wired and wireless—as part of the same audio signalling system, ensuring consistent behaviour across all units. You can add multiple wireless sounders as needed, with each unit independently supervised for battery condition and communication status, giving you scalable audio coverage that adapts to property requirements without compromising system reliability.

How does the 24-month battery life calculation work and what affects it?

The stated 24-month battery life assumes typical residential use patterns—approximately 80 seconds per day of entry/exit tone operation, which accounts for several daily arm/disarm cycles by household members. Your actual battery life will vary based on usage patterns, alarm activations, ambient temperature and battery quality. Properties with frequent entry/exit activity—such as busy households with multiple occupants or commercial premises with regular staff movements—will consume batteries more quickly due to increased sounder activation. The ultra-low 30µA quiescent current during standby means battery drain from wireless supervision is minimal, with most power consumption occurring during actual audio output at 100mA. The control panel continuously monitors battery status via wireless supervision, generating low battery warnings well before battery depletion affects operation, giving you adequate notice for scheduled battery replacement during routine maintenance visits rather than emergency callouts.

What’s the advantage of SSR mode over legacy wireless operation?

Scantronic Secure Radio (SSR) mode delivers significant advantages that benefit both installation efficiency and long-term system reliability. The AES128 encryption provides genuine cybersecurity rather than simple encoding, protecting against sophisticated wireless attacks that could compromise system integrity—increasingly important given the growing threat landscape and client awareness of smart home security vulnerabilities. Over-the-air firmware updates mean you can enhance device functionality and security remotely without site visits, reducing your ongoing service costs whilst keeping installations current with latest features. The optimised wireless protocols deliver faster response times for more immediate audio feedback, whilst simultaneously improving battery efficiency through smarter communication scheduling. For new installations, SSR mode with compatible i-on panels provides the most future-proof solution. The legacy mode ensures backwards compatibility with older Scantronic panels, protecting your clients’ investment in existing systems whilst enabling gradual migration to SSR capability as panels are upgraded.

Does the sounder need programming or does it work automatically once enrolled?

Once you’ve enrolled the SDR-2R-INT with the control panel following standard Scantronic wireless device pairing procedures, the sounder automatically reproduces all system audio events without additional programming. The panel wirelessly transmits audio instructions—entry/exit tones, alarm signals, fault indications—which the sounder interprets and reproduces at 80dB output. You don’t need to configure individual tone types or volumes; the unit handles all standard system sounds by default. However, you may want to verify the sounder’s behaviour during walk testing, ensuring entry/exit tones provide adequate warning time and alarm signals are clearly audible throughout the intended coverage area. The LED diagnostics help during commissioning, confirming wireless communication quality and battery status. If you’re installing multiple sounders, each operates independently but synchronously, providing consistent audio feedback across all units—useful for properties where occupants might hear multiple sounders simultaneously without creating confusing echo effects.

Can the SDR-2R-INT be externally powered instead of using batteries?

Yes, the SDR-2R-INT supports external power operation, which can be advantageous in certain installations where you have convenient access to 12V DC supplies or want to eliminate battery maintenance entirely. When externally powered, the quiescent current increases to 12mA compared to 30µA on battery power—negligible for panel power budgets but relevant if you’re calculating total system load. External power eliminates the 3-minute auto-silence limitation that applies to battery-only operation, allowing sustained alarm signalling if required by the installation specification. However, you’ll lose the wire-free installation benefit that makes the SDR-2R-INT attractive for retrofit projects and remote locations. Most installations run on battery power to maximise installation flexibility, with the 24-month battery life providing acceptable maintenance intervals that align with annual service visits. External power makes most sense where the sounder location coincidentally has accessible 12V supplies—perhaps near other powered devices—or where specific applications require extended alarm duration beyond the battery-powered 3-minute limit.