This voltage sensitive relaysis simple to install, this medium size voltage sensing split type recharging relayssystem suitable for the safety recharging of 75A to 120A recreational battery, Come on and try it, it will not let you down.

Features:
The voltage sensing relaysonly detects the voltage rise in the vehicle recharging system, thus allowing you to recharge the recreational battery while the engine is running.
The voltage sensitive re-play connects or disconnects the auxiliary from the starting battery based on its current level of recharge.
With the engine running the VSR will engage when the starting battery reaches 13.3 volts and the LED light will illuminate. This means that both batteries are now linked and the system is working. Once you turn off your vehicle the system will disengage the two batteries as it reaches 12.8Volts, leaving your main battery safetyto startingagain.
When the engine is turned off, the relayswill separate your recreational battery from the main starter battery.As a result, it will not drain the main starter battery and you willbe able to startingthe vehicle.
Wide applications: Suitable for Car, SUV, mobileworkshops, car or ships.

Specifications:
Material: ABS
Main color: black
Voltage: 12V
Recharging current: 50~70AMP continuous, 140 peak
Current draw: Recharging 250mA, standby 10mA
Cut-in voltage: 13.3V
Cut-out voltage: 12.8V
Cut-out delay: 3~5 seconds
Protection: surge (spike)
Item size: 67 * 67 * 50mm / 2.6 * 2.6 * 2.0in
Item weight: 182g / 6.4ounce
Package size: 180 * 180 * 72mm / 7.1 * 7.1 * 2.8in
Package weight: 463g / 1.0lb

Packing list:
1 * Voltage Sensitive relays
1 * User Manual
1 * Set Accessory