The Blaupunkt Mini ISD-HD1 is a very compact heat detector with a size of 5 x 5 x 4.4 cm. As the name says, the detector detects heat and no smoke. Ideal for the kitchen for example. The alarm signal of 85 dB goes off when the temperature is higher than 54 degrees Celsius or when the temperature rises too quickly. The permanently installed battery lasts up to 10 years. If the battery voltage is too low, an audible signal sounds from the detector. So you know in time that you can replace the reporter.