Features: Numbers and pointer clearly indicate water temperature. Blue LED light for easy reading in the dark. Measuring range: 20 to 120 degrees Celsius. High sensitivity and easy operation. Used to measure car water temperature. Specifications: Material: Stainless Steel Color: As picture Measuring Range: 20-120 Input Voltage: DC 12V Size: Approx. 8 x 7 x 6cm Temperature Sensor Overall Size(L x W): Approx. 41.68 x 12.83mm Temperature Sensor Thread Size(Dia x L): Approx. 9.46 x 9.8mm Wire Connection: Red for positive, black for negative Package Weight: Approx. 280g Compatibility: For 12V cars and racing cars Wiring method: A set of 4 cables: 1. Red wire connects to +12V power supply 2. White wire connects +12V headlight switch 3. Yellow wire connects ignition switch. 4. Black wire connects storage battery or car shell. A set of 2 cables: 1. Green wire is signal line for connecting sensor. 2. Black wire connects ground wire. (The last wire is spare wire for connecting similar items.) Rear Plugs Instruction: 1. 2-pin plug connects to external warning light (This item does not include the warning light) 2. 3-pin plug fits for signal line. 3. 4-pin plug is for connecting battery. (When there are two 4-pin plugs, you only need to choose one to connect the power, and the remaining plug is ready for another similar item without reconnecting the power) Package Content: 1 x Water Thermometer 1 x Holder 1 x Sensor Other Accessories