Steelman 97202 Wireless ChassisEAR Diagnostic Device Kit DETECT SQUEAKS AND RATTLES - Wireless ChassisEAR detects squeaks and rattles throughout a car or truck's chassis 50-FOOT RANGE - Noises can be transmitted up to 50-feet from the transmitter to the receiver allowing use on small and large vehicles NO TANGLED WIRES - Wireless transmitters means no running of long wires that get easily tangled BUILT-IN SPEAKER - Listen to noises with the built-in speaker or with headphones through the 3.5mm jack SIGNAL STRENGTH INDICATOR - LED lights indicate signal strength of the active channel ILLUMINATED CHANNEL BUTTONS - Illuminated buttons indicate the active channels and can be changed or muted with a quick push QUICKLY PINPOINT - Quickly pinpoint the source and location of errant noises 4 INDEPENDENT TRANSMITTERS - Kit includes 4 independent transmitters that can be mounted in locations across the vehicle