The Fyrewatch i9030 smoke alarm is a full size battery operated smoke alarm. The Fyrewatch unit utilizes ionization technology that protects against fast flaming fires and other types of fires. The i9030 is powered by a 9V battery, providing continuous protection, even during power outages. This easy to install unit includes a test button to verify the detection electronics are working as intended. The tamper resist feature makes your smoke alarm somewhat tamper resistant. This helps deter theft or tampering.