Ternary lithium battery L measurement: L03 string to L07 string (power-off memory) Lead-acid battery P measurement: DC12V, DC24V (power-off memory) Iron-lithium battery F measurement: F03 series to F08 series (power-off memory) Custom setting high and low voltage range: DC8-30V. The front is the on/off button, the back is the setting button, please set the parameters before installing and using Voltage detection range: DC8-30V. Working current: Less than 15mA (without charging function). Display mode: LCD screen. USB output: QC2.0, QC3.0, maximum output 18W (5V-3.4A, 9V-2A, 12V-1.5A). Typec output: QC2.0, QC3.0, maximum output 18W (5V-3.1A, 7V-2.4A, 9V-2A, 12V-1.5A) Detection accuracy: 1% Refresh speed: 500ms/time Installation size: 58.5mm x 36.5mm Appearance size: 61mm x 40mm x 22mm Mode On the main page, press and hold the on/off button for 2 seconds to enter the mode setting page, and then press and hold the back setting button for 2 seconds to exit the setting page and return to the main page. Mode 1 -- lead acid P setting; Mode 2 -- Ternary Lithium L setting; Mode 3 -- FeLiF setting; Mode 4 -- custom high and low voltage settings; Mode 5 -- low voltage alarm setting (alarm when the voltage is lower than this parameter); Mode 6 -- backlight time setting; Notice: There are two kinds of lithium batteries (ternary lithium L and iron lithium F), let me tell you the difference; first, fully charge the battery first, the saturation voltage of a series of ternary lithium batteries is DC4.2V, and the saturation voltage of a series of iron lithium batteries is DC4.2V. It is DC3.6V; for example: the saturation voltage shows 29.4V (7 strings), this is the ternary lithium battery, and then select the parameters according to the setting mode of the ternary lithium battery. Screen color:Blue Colour:black Material:plastic Package Contents: 1 X Battery power detector 1 X line 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.