Greenlee 802K Digital Lan Tracing Kit The 200FP probe features AC hum filtering, LED for visual signal strength indication, continuous on feature, 5-minute auto shut off and low battery indicator The 200FP also features slim, comfortable design, powerful rear-fire speaker, recessed on/off push button helps avoid accidental power turn on and adjustable sensitivity/volume control to increase tracing accuracy The AT8L LAN Toner features digital interaction with LAN hubs and switches, checks for shorts and service voltages and split able tone connections for tracking CAT 5/6 LAN cable Other AT8L features are LAN Hub tracking with activity light blinking, LAN Hub detection, check for powered ethernet, selectable tracing tones including ID577, 577 Hz / 1000 Hz warble and low battery indicator Performs a wide variety of basic wiring tests, traces high performance cables such as Cat 5 and is immune to AC power noise and checks for working LAN jacks