1、Touch about 5s to turn on or turn off the power. With Touch ON OFF switch, easy to use and save energy. It works for 5V‑48V. 2、The state of your battery between full charged and discharged. Support battery voltage value and capacity percentage of battery display. 3、The meter has easy to read LED segments and connect to your 12 volt system. Mini size and easy to install,work great for checking voltage. 4、Timely grasp the state of battery voltage, voltage measurement purposes can also be used for other products. 5、Used to monitor the storage battery voltage, with reverse connection protection function, line will not be burnt. Package Include:1 X Voltmeter Item Type: VoltmeterMeasure Voltage: DC 5V - 48VSize: Approx. 37x30mm/ 1.45x 1.18inNote: 1. Manual measuring, please allow 1 ~ 3mm error,thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.