Feature 1Numbers and pointer clearly show the water temperature 2Blue LED light for easy reading in the darkness 3Measurement range is 20~120 Celsius Degree 4High sensitivity and easy operation 5Used to measure the water temperature of automobileFeatures: Numbers and pointer clearly show the water temperature. Blue LED light for easy reading in the darkness. Measurement range is 20~120 Celsius Degree. High sensitivity and easy operation. Used to measure the water temperature of automobile. Specifications: Material: Stainless Steel Color: As Picture Shown Measuring Range: 20-120 Input Voltage: 12 V DC Size: Approx. 8 x 7 x 6cm/3.15'' x 2.75'' x 2.36'' Temperature Sensor Total Size(L*W): Approx.41.68*12.83mm/1.64*0.51in Temperature SensorThread Size(Diam. * L): Approx. 9.46*9.8mm/0.37*0.39in Wire Connection: Red for Positive, black for negative Package Weight: Approx. 280g Fitment: For 12 V autos and racing cars Wiring Method: A Set of 4 Wires: 1. Red wire connects + 12V power supply. 2. White wire connects the headlight switch + 12V. 3. Yellow wire connects the ignition switch. 4. Black wire connect the storage battery or car shell. A Set of 2 Wires: 1. Green wire is signal line to connect the sensor. 2. Black wire connects the ground wire. (The last wire is a spare one for similar item connection.) Back Sockets Instruction: 1. 2-pin socket links to external warning light(this item not includes the warning light) 2. 3-pin socket adapts to signal line. 3. 4-pin socket is for battery connection. (When there are two 4-pin sockets, you only need to choose one to connect the power, and the rest socket is ready for other similar item without linking the power again) Package Included: 1 x Water Temperature Meter 1 x Bracket 1 x Sensor Other Accessories