Review on Sperry Instruments ET64220 Wire Tracker Wire Tracer: A Must-Have for Audio / Video Installers, Coax, CAT 5, Speaker & Phone, with Adapter Plugs (RJ-45, RJ-11, Coax & More) - Yellow by Don Taniguchi

No audible "trill" in receiver as advertised. The receiver has no audio function at all and the only indicator you have is the light beaming away from you. On the other hand, the transmitter has an acoustic signal. However, this won't help you if you're in multiple rooms! Even the box says the receiver has sound. Likewise with the instructions. Which, by the way, needs to be downloaded from the Internet. Instructions not available. SEE IMAGE. Returned for a full refund. I will try somewhere else.