Voltage Display: With a voltmeter which display the real-time voltage. If you connect 2 batteries, then the voltmeter display the battery that has high voltage. High low pressure protection: Circuit be automatically disconnected so as to the main battery from over discharging. Automatic & Manual Model: the main battery is always . Very convenient and safe to use. Application: van trucks, caravans, UTV/ATV, boat, marine, bus, and camping applications etc. Rating Voltage: 12V Continuous Current: 140A Cut-in Voltage: 13.3V Cut-out Voltage: 12.8V IP Waterproof Rating: IP68 Cut-Out Delay: 3-5 Seconds Charing Currunt: 90-120APM CONTINUOUS, 160AMP Current DRAW: CHARGING 250mA,STANDBY 10mA PROTECTION SURGE(SPIKE) Terminal Studs: M6(1/4inch) Colour:Photo Color Material: Plastic Package Contents: 1x Smart Dual Battery Isolator kit Only the above package content, other products are not included. Note: Light reflection 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.