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Smoke Alarm HM-638PHM-AC

The Heiman HM-638PHM-AC wired interconnected smoke alarm is equipped with a 10-year battery backup and utilises Heiman’s advanced, precision-calibrated sensor technology, complying with the latest industry standards. This device allows multiple alarms to be interconnected, providing early warning throughout the home, whilst the 10-year battery backup ensures continuous protection in the event of a power cut, giving you complete peace of mind.

SPECIFICATION

Model	HM-638PHW-AC	HM-638PHW	HM-638PHM-AC
Power Supply	220–240V(50Hz, 1.2W MAX)	DC 3V, Built-in 10-Year Battery	120V AC, 60Hz, with 1 × CR-2/3AZ Backup Battery
Battery Life	Built-in 10-Year Battery Backup	10-Year Battery Backup	10 years (Battery Not Replaceable)
Transmit Power	5.7 dBm	5.7 dBm	/
Wireless Protocol	868 MHz	433 MHz	/
RadioProtocol	SRD	SRD	/
Sound Level	≥85 dB (at 3 m)	≥85 dB (at 3 m)	≥85 dB (at 10 ft)
Operating Temperature	0 °C ～ +50 °C	0 °C ～ +50 °C	40 °F (4.4 °C) ～ 100 °F (37.8 °C)
Operating Humidity	≤95% RH (Non-condensing)	≤95% RH (Non-condensing)	≤95% RH (Non-condensing)
Wireless Interconnection	Up ～ 40 Alarms Maximum	Up ～ 40 Alarms Maximum	/
Wired Interconnection	Up ～ 20 Alarms over 250 m Maximum	Up ～ 20 Alarms over 250 m Maximum	Up ～ 20 Alarms over 250 m Maximum
Dimensions	L125 mm × W125 mm × H46 mm	L125 mm × W125 mm × H46 mm	L125 mm × W125 mm × H46 mm
Certification	CE、BSI、UKCA、RCM、AS 3786	CE、BSI、UKCA、RCM、AS 3786	UL217 、CAN/ULC S531 、FCC、RCM、AS 3786

Hardwired Interconnection

Interconnect multiple units for whole-home coverage.
When one alarm triggers, all units sound together.Expand protection across bedrooms, halls and floors.Hardwired reliability ensures constant power connection.
Early Warning Detection

Advanced sensing technology detects smoke rapidly.Provides precious extra time for safe evacuation.Reliable photoelectric sensor reduces false alarms.Guards your family with responsive fire detection.
10-Year Sealed Backup Battery

Sealed lithium battery provides decade-long backup power.Protects your home even during electrical outages.Eliminates frequent battery replacement hassles.Long-lasting reliability for continuous safety coverage.
Oversized Button for Easy Test & Hush

Large, easy-press button for effortless testing and silencing.Quickly hush false alarms with a single touch.Convenient for users of all ages, including seniors.Simplify daily operation while ensuring reliable protection.
End-of-Life Reminder

Automatic alert when the alarm reaches lifespan limit.
Ensures timely replacement for uninterrupted safety.
Never guess when your device needs upgrading.
Stay protected with proactive maintenance reminders.