The upgraded dual power supply isolator adopts power management chips, and has relatively novel electronic circuit intelligent automatic management functions. It also has the characteristics of strong waterproof, low loss, good heat dissipation and high efficiency. Instructions for use: When the voltage of the main battery is 13.3V, the main battery charges the auxiliary battery; when the voltage of the main battery is lower than 12.7V, the main battery and the auxiliary battery are disconnected. Prevents you from draining the battery. Automatically combines two batteries when charging and isolates the two batteries when not charging. Suitable To Install into Van, car, Leisure Vehicles & Marine Applications. Not 70 Amp Cable As Per Some Other Similar Priced Kits. No voltage compared to battery isolator diodes (0.6V). Glass Fiber reinforced Nylon enclosure. Built-in LED indication (ON when VSR engages). Surface or panel mount provide flexibility when installing. Optional Storage Mode allows zero power consumption when the engine is off. Product parameters: Type: 12V Voltage Sensitive Relay Continuous current: 100-120A Instantaneous current: 160A Current Consumption - Charging: 250mA Current Consumption - Standby: 8mA With anti-reverse connection function Ambient temperature: -20~50 Detachment delay: 5-10 seconds Recommended Fuse: 80Amp Power stud: M6 copper screw nut Surge Protection: Built-in Dimensions: 68x52x68mm Colour:black Material:ABS Package Contents: 1 x Digital Display Voltage Sensitive Relay 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.