Never used product, packaging damaged during transport. Unopened product, repackaged in our warehouses, in perfect working condition, warranty available. 5-level modulation temperature? Maximum reset ratio: 0, ?, 1, 2, 3, 4, 5. Simply use the modulation index arrow 0 to turn off the thermostat. The thermostat head has 5 temperature levels for easy adjustment and is equipped with a liquid sensor and a zero position. Premium material? The thermostat is made of high-quality material, with fine workmanship and good performance, it is robust, not easy to break, and practical and durable to use. No fixed temperature setting range? The thermostatic radiator valve has no fixed temperature setting range and is affected by the heating temperature and room temperature. Frost protection function? The thermostatic radiator valve has frost protection, a liquid level sensor, and a zero-point adjustment, which provides adjustment assistance and detects outdoor temperature fluctuations. Thermostatic valve? The thermostatic radiator valve is suitable for M30 x 1.5 threaded connections. Threaded radiator connections, suitable for compact radiators with integrated valves. Please check before purchasing that this thermostat head is compatible with your valves and that only the head is included.