Description: Length: 40.2mm, width = 12.8mm, thick ≈14mm Display color: Red Display mode: 1. display time only 2. display temperature only 3. display only voltage 4. time temperature voltage alternating display (Note: under alternate display mode, through dd option to choose whether to display the temperature or voltage, dd:0 displays time + temperature + voltage. dd:1 displays time + voltage. dd:2 displays time + temperature) Features: 1. Set the time, temperature, voltage, three functions in one 2. manual error correction function with a temperature setting range -5â„� ~ 5â„� 3. With backup battery, power-down time to continue to go Electrical Characteristics: 1. Input voltage 7 ~ 30V. Note that when using as a voltmeter, the input voltage is at least more than 7V. 2. Voltmeter range 7 ~ 30V, error ± 0.1V, the measured voltage is the input voltage. 3. Temperature measurement ranges from -50 to 130â„� 4. Working current is about 30MA.