Shop Nilight 12V 140 AMP Dual Battery Isolator Auto Manual Voltage Sensitive Relay with Digital Voltmeter Smart VSR Automatic Charger Disconnect w/Voltmeter for Truck RV UTV Boat Can Am in high quality, support 2 year warranty. The Dual Battery Isolator 12V 140 AMP is equipped with an LED display that shows the current voltage status in real-time so that you can check the battery status at any time.