Features: Working voltage: DC 4-30V. Temperature range: -50C ~ 120C. Two types available: annular sensor or rod sensor. Easy installation: Red wire for positive, black wire for negative. Widely used in fish tanks, refrigerators, water temperature monitoring, and temperature control for protection. Specifications: Material: ABS Type: Annular sensor or rod sensor (optional) Operating voltage: DC 4-30V Temperature measurement range: -50C to 120C, accuracy 1.7C (not adjustable) Working current: 20mA Temperature sensor: Ring-shaped or rod-shaped 3950 10k 1% sensor, 100cm cable length Package Includes: 1 x Digital Thermometer Note: Please allow 1-3 cm error due to manual measurement. Ensure you are comfortable with this before purchasing. Due to differences in monitor displays, the image may not reflect the actual color of the item.