Honeywellâ€™s 5808W3 is a 3V lithium powered, photoelectronic smoke/heat detector with a built-in wireless transmitter. Smoothing algorithms minimize nuisance alarms by smoothing out short term spikes from dust and smoke â€“ virtually eliminating nuisance alarms. Since there are no holes to drill or wires to run, you can preserve the beauty of the building while protecting it. The 5808W3 is an ideal smoke detector for those difficult to wire locations, applications where room aesthetics are critical, or where hazardous materials exist. All models also feature a restorable, built-in, fixed temperature (135Â°F) thermal detector that is also capable of sensing a pre-freeze condition if the temperature is below 41Â°F.