The JPS NIR-10 audio filter allows reception of difficult to read signals and reduces listener fatigue. 

Operates on radio receiver audio outputs then provides its own volume-adjustable processed audio to an external 3 to 8 ohm speaker (not supplied). 

The NIR-10 reduces or eliminates white/pink noise, ignition noise, static interference, RTTY interference, and power line noise. PEAK function reduces white noise interference. 

The Notch Filter mode removes multiple heterodynes and acts in 3 milliseconds. 

Band Pass mode has continuously adjustable center frequency, selectable bandwidths (0.25, 0.6 and 1 kHz), vertical-skirted filters, and greater than 60 dB ultimate rejection. 

The rear panel has RCA phono jacks for:  Audio Input, Speaker Output, Remote Bypass, Inv Rem Bypass. 

There is also a jack for 12 VDC Input (1 Amp). 

The front panel features a 1/4 inch headphone jack. 7 x 2 x 7 inches.