Feature：
Size: Large: 111MMX45MM
Small: 48MMX32MM
RCA hole distance: about the 25MM, up and down 18MM (center)
Voltage: AC / DC: 12V-0V-12V or 0V-12V
(9-15v can be used)
SP22 23 A238 PRA800 cooling chassis supporting
 
Note: The signal selector switch board screw 8.8MM our chassis hole open are 7MM

Package：

1pc Audio signal Selector Relay Board/ Signal amplifier switching board  (Convenient for buyers of installed, terminal (terminal) and the leds are not on the welding (attached))