This is an ionization-type smoke alarm with a high and stable sensitivity design. It is operated with an AC 220-240V main component with a single DC 9V block battery backup. The smoke alarm is equipped with a quick fix mounting bracket and a simple AC connector for easy installation. Keep your home safe with this high-performance smoke alarm.

• Insect proof and tamper proof. 
• Alarm and AC power supply indicator.
• Extra loud alarm sound over 85dB.
• Low-battery warning indicator.
• Auto reset when smoke clears.