<p>The Kidde Firex KF20R mains-powered optical smoke alarm that can be interlinked with up to 23 other Kidde mains alarms, be they ionisation, optical or heat. Once interlinked, the detection of the relevant danger by an individual unit will sound across all the connected alarms.</p> <p>Features:</p> <ul> <li>Interlink with up to 23 Firex hard-wired alarms &ndash; all alarms sound if danger is detected</li> <li>Alarm memory &ndash; identifies source unit within interconnecting network</li> <li>Reduced energy consumption &ndash; lower lifetime running costs</li> <li>Dust compensation and bug screen &ndash; reduces nuisance alarms</li> <li>Combined Test/HushTM button allows regular testing of alarm function and can be used to temporarily silence nuisance alarms</li> <li>Auto reset after activation</li> <li>Tamper-resistant locking device prevents unauthorised removal without the use of a tool</li> <li>Mains operation &ndash; Built-in rechargeable Lithium back-up tamper-proof battery</li> </ul> <p>Specification:</p> <ul> <li>Sensor Optical, circular lateral chamber with insect-resistant width, 9-slot entry portals</li> <li>Chamber Size 35mm outside diameter x 16mm depth approximate (external)</li> <li>Detection Band Infrared light wavelength</li> <li>Button Test Simulates the effect of smoke within the sensing chamber, checks electronics and sounder</li> <li>Automatic Self-test Circuitry is tested and unit beeps (chirps) if fault is detected</li> <li>Supply Voltage 230V AC, 50 Hz (nominal UK voltage)</li> <li>Power Consumption &lt; 15mA</li> <li>Connection Push-in/snap-fit type connector with 150mm long flying leads (supplied)</li> <li>Battery Back-up Non user-replaceable 3 x 3V rechargeable Vanadium Pentoxide Lithium cells (VL2330)</li> <li>Power-on Indicator Continuous green LED</li> <li>Alarm Sounder Electronic piezo-electric sounder (T3 pattern sound - three pulses - space - three pulses) with</li> <li>soldered contacts</li> <li>Sound Output 85dB (A) minimum at 3 metres</li> <li>Alarm Frequency 3.2 kHz typical</li> <li>Dust Protection In-built foam gasket in rear of alarm to prevent dust ingress into rear of the alarm</li> <li>Alarm Status Red LED flashes approx once every five minutes = normal operation</li> <li>Red LED flashes once a second = sensing smoke (sounder alarm sounds)</li> <li>Red LED flashes once every ten seconds = in hush condition (auto-reset after 15 minutes)</li> <li>Interconnection Up to 24 Firex and Kidde &lsquo;Slick&rsquo; units (smoke, heat and CO) can be hardwire interconnected</li> <li>with optional control (see below)</li> <li>Optional Controls Wired Remote Test and Hush Unit (REMTH) allows test and hush of interlinked units</li> <li>Optional Pattresses SMK23RU also has integral switchable relay for operating remote devices</li> <li>SMK4896 &ndash; Surface mounting base for added ease of installation</li> <li>Fixing Mounting bracket ring supplied with two &lsquo;T&rsquo; slot fitting option</li> <li>57mm spacing to a maximum of 90mm for standard screw fittings on back boxes</li> <li>Bracket has 50mm diameter central access hole for cabling</li> <li>Plastics used NORYL &ndash; Cover, main body and mounting bracket</li> <li>Lead-Free Status All Firex alarms are lead-free</li> </ul>