The probe adopts a DS18B20 temperature sensor chip. Its probe is made of stainless steel which is waterproof, moisture-proof, and anti-rust. Stainless steel housing of 6 x 50mm and Lead length of 100cm. Please note that the temperature probe requires no external components and has a single bus interface. High-quality stainless steel tube encapsulation waterproof moisture-proof prevents rust. Feature Designed to monitor and set temperature and humidity, simple and useful. Can work with temperature & humidity monitoring switch, can detect the real-time temperature & humidity of the environment. With waterproof, moisture-proof and anti-rust with the high-quality stainless steel tube encapsulated. Perfect and cost-effective monitoring sensor for your DIY smart home. No other components, unique single bus interface. Specifications Color: black. Size: 100cm. Material: stainless steel, plastic. Power: DC3.1-5.5V. Working temperature: -40-+80 degree. Operating Temperature Range: -55°C- +125°C. PLS NOTE: this waterproof probe can only measure the temperature, but not measure humidity. Package included: 1 * temperature sensor.