Sierra BS11000 2-Position Battery Switch - ONOFF The Sierra BS11000 Battery Switch is a 2-position switch with ON-OFF function. This battery switch features a unique ergonomic and aesthetic knob design and a robust glass fiber reinforced nylon enclosure. Surface or panel mount options provide flexibility during installation and removable windows on all four sides allow for unobstructed wiring. Features Removable knob for added level of safety and isolation Robust Glass Fiber reinforced Nylon enc