The shell is made of strong flame-retardant nylon, which has the characteristics of high temperature resistance, no drop, durability, protection of the supply from leakage, water, corrosion.The main battery isolation switch has a waterproof protective cover, which can better protect the dust and water in the keyhole.The battery isolation switch cuts off their , you don't need to worry about there is no electricity after a long vacation or business trip , batterieswill be failing to start.The key can be taken down when there is no connectionEffective to solve these problems: electric leakage and loss of electricity, extend battery lifeThe key can be taken down when there is no connectionWaterproof cover can better protect key holeHigh Quality -- The shell is made of strong flame-retardant nylon, Copper terminals with stainless steel hex nuts for improved.continuity, which is resistant to high temperature, not afraid of falling, durable, and protects the supply from leakage, water, corrosionDurable Battery Isolator and Easy operation: disconnect and reconnect battery with turn on/off key.Effective to solve these problems: electric leakage and loss of electricity, extend battery lifeQuick Battery Disconnector (Cut off Switch) , Perfect for maintaining the batteries charge over time.Better protection for and boats: The battery isolation switch cuts off their , you don't need to worry about there is no electricity after a long vacation or business trip , batterieswill be failing to start.colour: Black + redMaterial: Plastic + metalPackage Contents:2 x battery switch6 x Cut off switch key2 x waterproof coverOnly the above package content, other products are not included.Note: Light 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.