Features:
– with bi-sensor technology (smoke + heat)
– 12 years battery life (lithium)
– built in battery
– displays if battery empty
– alarm signal 85 dB
– with a large test button
– cyclic genuine self-test function
– 5 years warranty
– Including 9 V and 1,5 V battery
– more safety
– fits to bedroom without LED
– magnetic plate is included