S J Security Systems Pvt. Ltd. Manufactures Four to Eight Input Auto Switcher with Speaker and Volume Control. 4-8 Input Auto Switcher with Speaker and Volume Control is an economical one way audio automatic sequential switcher with Auto, Manual, By-pass facility. Switcher timing is adjustable from 1 to 25 second. Four to Eight Input Auto Switcher with Speaker and Volume Control features LED camera indicator and override for homing or by-pass capabilities.