This is a very useful, waterproof, panel-mount momentary switch with RGB LED. It is a SPST N.O. with the threaded portion being 16mm in diameter. The overall length (including leads) of button is 33mm and has small solder lugs for connection, cable length is 50cm. This switch can work with our AudioB I2S V4 amps which is now availble on all our amps except the TSA8804 V4 to use one button controls the multipoint(party mode) amplifier pairing.