GEREE DC 0-300V 0.56" Blue LED Digital Display Voltmeter Power Monitor Panel Meter Display: Three Digit 0.56' Blue LED digital. Good-quality material: Its strong plastic case prevents it from easily damaged by outer force. Easy to connect wires: It has only three wires(the red,yellow and the black),simply connect the red. With reversed connection protection, meaning meter will not burn when connected reversely. GEREE LED Digital Display Voltmeter warranty--30-Day Money Back Guarantee -- 12 Month Replacement Warranty -- Lifetime Support Guarantee