Toggle button:Built-in switch to turn off the , no consumption after turning off. The supply voltage is manually switched by default; the double-button design makes the setting simple and efficient, and it only takes a few seconds to complete the setting. Notification Design:When the battery is lower than 20%, the meter display will flash to remind you in time. Wide range of applications:Lead-acid battery DC supports 12/24/36/48/60/72/84V, lithium battery DC supports 3-24 series use, iron-lithium battery DC supports 4-24 series use, which is convenient for your daily needs. Working voltage: 12-84V Display: Capacity/Voltage Backlight:A: White Colour:black Material:ABS Package Contents: 2 x Voltmeter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.