Detailed Description

The Sperry ET4220L is a multi-purpose wire tracer designed to identify and trace unenergized wires and cables. It is a staple tool for audio/video installers and datacom technicians.

• Transmitter (Model ET4220L-T): Features a unique "nesting" design where the receiver fits directly into the transmitter for storage. It includes five built-in adapter plugs: RJ-45 (Ethernet), RJ-11 (Phone), Coax, Automotive Fuse Blade, and Insulated Alligator Clips.

• Receiver (Model ET4220L-R): An inductive probe that picks up the signal without needing to strip insulation. It features an adjustable sensitivity dial and both audible (warbling tone) and visual (LED brightness) indicators.

• Power Requirements: The transmitter typically uses 2 AAA batteries, while the receiver uses 4 LR44 button cell batteries (shown in your fourth image).

• Safety Note: This tool is strictly for unenergized (dead) wires. Using it on live circuits can damage the unit or cause injury.