48 volt phantom power tester for mixer inputs and microphone preamp inputs. Just attach device to end of microphone cable or directly to input and the LED’s will glow. High intensity red and green LED visible in all lighting conditions. Can also be used for basic cable testing. Red LED verifies conductivity to pin 2, green LED verifies conductivity to pin 3. No LED indication indicates either no phantom power or bad ground connection on pin 1. Made in the USA.