Mini LCD Voltmeter with Alarm. Designed for Battery Voltage Monitoring. 10-30V DC. Mini LCD voltmeter with pre-programmed low voltage warning flashing back light. Surface mount LCD digital panel meter. Features: compact surface mount design which can be mounted on a dashboard or any other flat surface; large 3 digit LCD display with back light; pre-programed Low Voltage Alert logo indicator with flashing back light; reverse polarity protection; 2 wire operation; weather proof PVC casing design; easy D.I.Y installation. Specifications: measuring range: 10 - 30v DC; LCD Display: 15mm x 6mm, 3 digit resolution with white back light; power consumption: 10mA; factory programmed flashing back light when voltage drops to below 11.0V DC; meter size: 65mm length x 30mm width x 15mm depth.