Parameters: Working Voltage:10-100V Power consumption: 8-10mA (backlight on) Temperature measuring range: 0-179℉ Features: 4 in 1 Meter --- not only can display battery capacity and voltage, but also can display the Fahrenheit or Celsius temperature . Temp Display --- Fahrenheit and Celsius temperature are available, can be easily switched by the key. Switch ON/OFF -- Designed with the turn on/off switch, convenient for daily using. Size Information: Product size: 61.5x33.5x13.5mm Installation dimension: 58.5x28.5mm Display size: 33x16.5mm Package Includes: 2x 48v Battery Meter Applicable Battery Type --- DROK digital battery monitor is suitable for 10-100V (12v 24v 36v 48v 60v ) lithium battery, lead-acid battery, lithium iron phosphate battery, Ni MH battery. Application --- Can be used as battery voltage meter and battery capacity tester for car, marine, RV, boat, etc. Temp Gauge in F. --- The temperature indicator can display in Fahrenheit. (Note: the temperature is not the air but the internal meter temperature.) The 1 You Want --- Easy to install and use. Allows you to program the percentage with a corresponding voltage. Default --- 48 volt lead acid battery.