This is a passive headphone junction box with 1/4" and female XLR inputs, and 6 1/4" outputs.

Calrad's 15-132 headphone junction box provides equal signal output for 1 to 6 stereo headphones, without changing the signal. XLR and 1/4" inputs are provided. This unit can be used with 8 and 600 ohm impedance headphones. Made in Los Angeles, California by Calrad Electronics.