1、Premium Material: Battery disconnect switch is made of premium ABS and tinned copper material, rustproof, high strength, sturdy and durable. 2、Function: Battery cut off switch isolates start and house circuits and combines both battery banks for emergency starting, with 3 position(OFF/ON/PLUS). 3、Excellent Performance: Battery switch has good electrical conductivity, IP66 waterproof, ignition protection, heavy duty, stable and reliable. 4、Simple Installation: The installation is simple, mounting holes accept 3/8in (M10) stud, not easy to loosen, convenient for using, save your efforts. 5、Wide Application: Power kill switch with 300 amp continuous rating suitable for outboard and small petrol or diesel engines, ideal for RV or boat.