Speaker Probe, Data Safe Monitor Yes, Display Screen Type LED, For Use With Any Tone Generator, Includes Adjustable Volume Control, Headset Jack, LED Flashlight, Recessed Telephone Test, Visual Signal, Features Powerful Speaker For Noisy Environments, Recessed On/Off Button Control And High Gain For Accurate Wire Identification In Congested Cable Bundles And Equipment Rooms. Adjustable Volume Control For Precise Identification, An LED For Visual Signal Strength, Alert Type Sound, Waterproof Yes