ES120 general purpose smoke alarm. 9V Battery-operated (battery included). Ionisation type detector (for early warning). Automatic low battery warning signal. Extra loud alarm. Functional test button. LED operation indicator. Hush feature (allows temporary alarm override in case of false alarm). Mounting clip & screws included. Manufactured under a quality system certified as complying with ISO 9001 by an accredited certification body. Packed 3.