Overview

Unobtrusive Size. Uncompromising Protection.

KEYPLUS Mini Photoelectric Smoke Alarm (TSS303A)

The KEYPLUS TSS303A is an ultra-compact mini photoelectric smoke detector engineered for reliable, decade-long fire safety. Powered by a sealed-in, non-replaceable 3V lithium battery that lasts over 10 years, it eliminates frequent battery changes and maintenance hassles. Fully conforming to European EN14604:2005/AC:2008 safety standards, it combines advanced automatic dust compensation with a new anti-false-alarm chamber design. Featuring an 85dB piercing acoustic siren at 3 meters, an 8-minute silence feature, and a 10-hour low-battery do-not-disturb mode, it provides discreet, unobtrusive protection for hotels, residential complexes, student housing, and commercial properties.

Pain Points & Challenge

Most Smoke Alarms Are Taken Down for the Wrong Reasons.

When fire alarms become annoying, properties become vulnerable:

False Alarm Frustration: Dust build-up and optical chamber drift cause unexpected false alarms, leading tenants or staff to dismantle the unit.
The Midnight Chirp: Low-battery warnings inevitably chime at 3 AM, creating service headaches and tenant complaints.
Maintenance Overhead: Managing hundreds of rental units or student dorms with annual battery replacements drains time and budget.

Key Capabilities & Benefits

10-Year Sealed Power & Maintenance-Free Operation

Feature: Integrated with a sealed, non-replaceable 3V industrial lithium battery providing over 10 years of operational lifetime.
Advantage: Continuous, tamper-proof power from day one of activation through the entire statutory life of the detector without battery degradation.
Benefit: Reduce property management overhead to near zero. No annual battery swaps, no risk of tenants stealing batteries for other gadgets, and guaranteed fire readiness around the clock.

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Advanced Chamber Architecture & Automatic Dust Compensation

Feature: Precision photoelectric chamber featuring automatic dust compensation and a new aerodynamic baffle layout.
Advantage: Automatically adjusts its optical detection threshold as microscopic dust accumulates over time, preventing baseline drift and distinguishing true smoke from contaminants.
Benefit: Say goodbye to nuisance false alarms. Keep emergency alert reliability high while avoiding unnecessary evacuations and costly false fire department call-outs.

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Ultra-Compact Aesthetic with Smart Hush & Do-Not-Disturb Logic

Feature: Measuring just Φ68 × 39 mm, certified to rigorous EN14604 standards, equipped with an 8-minute hush button and a 10-hour low-power non-disturb mode.
Advantage: A clean, discreet design that blends invisibly into high-end architectural ceilings, combined with human-centric quiet periods for non-critical low-power signals.
Benefit: Preserves architectural aesthetics in boutique hotels and residential spaces. If a low-battery signal occurs at night, the 10-hour delay prevents sleep disturbance until regular maintenance hours arrive.

Technical Specifications

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Model Number	TSS303A
Device Category	Smoke Sensor / Environment Sensor
Detection Principle	Optical Photoelectric Chamber
Power Source	Built-in non-replaceable DC 3V lithium battery
Product Lifespan	> 10 years
Standard Compliance	EN14604: 2005 / AC: 2008
Alarm Output	Acoustic Siren ≥ 85 dB at 3 m + Flashing Red LED
Silence Function	Approx. 8 minutes hush duration
Do-Not-Disturb Mode	10-hour low-battery notification delay
Self-Maintenance	Automatic dust compensation design
Dimensions	Φ68 × 39 mm
Operating Mode	Standalone acoustic / optical alarm

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The KEYPLUS TSS303A is an ultra-compact mini photoelectric smoke alarm certified to EN14604. Featuring a 10-year sealed lithium battery, auto dust compensation, and an 85dB siren, it delivers maintenance-free, false-alarm-resistant fire safety for modern spaces.

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