Features and Benefits: NOISE DETECTION - Detect the source or squeaks, rattles, and other errant or troublesome noises 50-FOOT RANGE - Transmitters have a 50-foot signal range allowing use on small and large vehicles BUILT-IN SPEAKER - Monitor sounds with the built-in speaker or via headphones through the 3.5mm jack SIGNAL STRENGTH INDICATOR - LED lights indicate signal strength of the active channel ILLUMINATED CHANNEL BUTTONS - Active channels have illuminated buttons and can be changed or muted with a quick push NO TANGLED WIRES - Wireless transmitters means no running of long, easily tangled wires and cables 4 INDEPENDENT TRANSMITTERS - Includes 4 independent transmitters for monitoring multiple locations COMPATIBILITY - Transmitters and receiver are not compatible with older, STEELMAN 60635 and 97202 models Replaces JSP60635