Wide Working Voltage Range: This battery monitor can tolerate widest working voltage range (DC 6-63V).Can be adjusted to 12V, 34V, 36V, 48V according to the battery voltage.Powered by tested circuit, don 't need extra power source. PVC Waterproof Screen Protector: Waterproof with two buttons.The function button is for switching from Capacity, Voltage and Turn off.Choose to display voltage, battery capacity percentage alone or in turn by pressing the function button.The setting button is for select battery and so on. Clear and Bright LCD Display: The battery monitor is designed with high quality LCD, offers clear and bright display from every angle.Automatically turn into sleep mode in 10s for saving the power. Reverse Polarity Protection: Simple connection with reverse protection, 't burn if connect reversely. Suitable Battery Types : The battery detector is suitable for lithium batteries and lead-acid batteries, such as Ternary lithium batteries, polymer batteries, lithium-ion batteries, storage batteries. Note: it cannot be used for Lithium Iron Phosphate batteries, 1-2 Li batteries in series and over 15 Li batteries in series. Colour:black Material:plastic Size:24 x 44mm Package Contents: 1 * battery meter 1 * wire Only the above package content, other products are not included. Note: Light 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.