Feautres: Reverse connection protection, and there are only two wires, easy to connect and use. LCD screen with blue / green / white backlight. Equipped with a PVC film, the surface is waterproof. Built with buckle, no screw mounting. When switched on, the percentage of power is displayed, and the remaining battery is displayed visually. Specification: Type: Battery Capacity Voltage Meter Material: HTN /-PCB Weight: approx. 13.7 g. Product size: 43.3*23.6mm Open-Hole size: 40.8*20.8mm Standard voltage: 12-48 V. Area of application: battery or devices with battery. Working temperature: -10 - 50 C. Package contents: 1 x battery capacity voltmeter. 1 x cable. Note: 1. Please allow for slight errors due to manual measurement. 2. Different monitor colours may vary. Thank you for your understanding.