Temperature sensing components: Precision metal bellows provide precise temperature control of all loads and applications. Easy to install: external installation, standard installation cassette type 86, easy to install. Safe and flame retardant: The shell is made of flame retardant ABS material. Lifespan: thermostatic contacts at 220V, full charge, more than 100,000 times, manual switching more than 60,000 times. Product features: beautiful appearance, comfortable hand, stable performance. Technical parameters: Sensor: AC801 A: Inflatable bellows, AC801 C: Thermistor Rated voltage: 220V / AC, 50 / 60Hz Rated current: 1A Constant temperature range: 10 ~ 30 C Temperature deviation: 1C to 25C Environmental conditions: -20C ~ 55C Materials and colors: The base, cover and dial are made of white ABS engineering plastic. Relative humidity: