... Executive Guardmode:Waterproof Model Number:COB 63A Waterproof Hoist Pushbutton Switch,COB 63A 1,UsageIt is suitable to be used in ... "A" means with total power switch, "no letters" said without total power switch:"B" means total stop and switch. "K" means with start ... , remount the bottom cover in the end. Waterproof Hoist Pushbutton Switch