Features: 1. The product design into some cigarette type, use, directly inserted into the car cigarette lighter, very convenient 2.12-24 v input voltage, can be used in automotive, truck, rv, boat, bus, etc 3. The thermometer can test - 10-80 temperature, may at any time within the check-out car current state temperature. 4. The voltage meter can measure 8-36 v voltage, pay close attention to the car voltage state at any time, can timely deal with emergency and ensure driving safety 5. This product is charging circuit adopts special high efficient IC design, with makings fastidious, charging for a long time no fever, prolong service life, ensure use safety Auto car seal voltmeter with cigarette lighter type thermometer voltmeter thermometer double LED display 12VSpecifications: Name: car one voltmeter + thermometer Model: CS - 302 Size: 4 cm in diameter, length: 7.5 cm Material: ABS environmental protection, intelligent IC chip surface Light color: Red + Blue, Red + Red, Red + Green display The input voltage: 12 to 24V Voltage measurement range: DC8-36V Temperature measurement range: - 10-80 Installation method: use, directly inserted into the cigarette lighter car inside can be normal use 1 x LED Dual Digital Thermometer Voltmeter