1、Dual Circuit: Simultaneously switches two isolated battery banks, circuits of different voltages, positive and negative lines with one simple ON/OFF switch, such as 12 volt and 24 volt. 2、Ignition Protection: Make before break contact design allows switching between battery banks without power interruption. Isolating cover with snap‑on sections protects rear contacts 3、Safe Installation: Ideal for marine or RV applications, can be securely mounted in gasoline powered boats. Case design allows surface, front panel, or rear panel mounting. 4、Premium Materials: Red copper silver plated studs with 7/8in (22.22mm) length for maximum conductivity, accepts 3/8in and M10 ring terminals, and the metal materials is marine grade rustproof. 5、Excellent Features: Tactile textures indicate knob position by feel only. Label with international ON OFF legends. Removable knob remains positively retained. ICON label set included for circuit identification.